How many water bottles make up a gallon? In the US the volume of a gallon is 128 fluid ounces, so 7.573 bottles of 16.9 ounces each constitute a gallon. The U.K follows a gallon equal to 160 fluid ounces and hence 9.467 bottles of 16.9 ounces will make up the gallon. However, the sizes of bottles may be variable and hence the number of bottles to make up the gallon may vary.
How many water bottles in a gallon?

a Total number of water bottles that make the gallon is dependent upon the size of the bottle that is considered to fill the gallon. So, if one wants to know that how many water bottles in a gallon, he must consider first that which size of the bottle he wants to consider?

Generally, a US gallon is 128 fluid ounces, so if you want to calculate the number of bottles required to fill a gallon, you have to divide the ounces of the water bottle to obtain the answer.

There are water bottles with variable size but a simple method is that the total fluid ounces of a gallon is divided by ounces of the bottle.
For example
If we have a water bottle that has a size of is 16 ounces, then we will need a total of 8 bottles to make the gallon. However, if we have a water bottle with 32.0 oz, then we will need only 4 bottles to make the gallon. A 1.0liter bottle with water is nearly 33.80 oz, so approximately 3.80 bottles make a gallon.
Number of ounces in a gallon:

1.0 gallon of water 15 bottles of 8 ounce

1.0 gallon of water 7.5 jugs/ containers at 16 ounce

1.0 gallon of water 7.1 containers/ bottles at 16.9 oz.

1.0 gallon of water 4.610 containers of 26 ounce

1.0 gallon of water 3.8 jugs of 32 oz

1.0 gallon of water 3.55 jugs of 33.8 oz
To the point
To calculate water bottles that make up a gallon, two types of gallons are considered, US fluid gallon and U.K gallon. US gallon is 128 ounces and needs 7.57 bottles of 16.9 oz. A U.K gallon is 160 ounces and requires 9.46 bottles to fill it completely.
Measurement systems for Gallons
There are three main types of measurement units, metric system, US measurement system, and U.K measurement systems. The size of a gallon is slightly variable in different systems. They are elaborated as:
1. Metric system

According to the metric system of measurements, a halfliter bottle (500 ml) consists of nearly 16.9 ounces, while an ounce is a unit of measurements.

However, dry ounces and fluid ounces are considered as two different things. Different systems are used in different regions, so which system do you use depends upon the region in which you live.
2. U.S system of measurement
In contrast to the metric system, in the US measurement system, a gallon is considered to have a volume of 128 fluid oz and 3.785 liters. So, if we are taking the bottles of 16.9 oz, then approximately 8 (7.57) bottles will be required to make up the gallon of 128 oz.
This calculation is done in a single step by dividing the number of fluid oz in a gallon by the ounces of the bottle. For example:
 One US gallon = 128 oz
 One bottle = 16.9 oz
 Bottles needed to make up the gallon = 128/16.9 = 7.573 bottles
As, it’s a bit difficult to go with 7.573 bottles because of the unavailability of this measurement, so it’s generally considered as 8 bottles.
3. The imperial system of the U.K

As we have seen previously that a US gallon has a volume of 3.785 liters and 128 ounces. It’s a bit different when taking the same gallon according to the U.K Imperial system.

In the imperial measurement system, one Gallon is equal to the 160fluid ounce which when converted into liters comes out to be 4.546 liters. So, to fill a gallon of 160 oz or 4.546 liters, there is a need for 9.467 bottles of 16.9 oz.
Here is a simple flow chart for the calculations:

One U.K gallon = 160 fluid ounces

U.K gallon in liters = 4.546 liters

Volume of the bottle considered = 16.9

Number of bottles to make up the gallon = 160/16.9 = 9.467 bottles
Similar to the US system, the number of bottles required according to the imperial system is also infractions, so it can be taken as 9.5 (9 bottles + ½ bottle of 16.9 oz)
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What is a gallon?
A gallon is used to measure the volume of fluids (maybe gas) and its capacity is considered in both systems, US customary units and units of the imperial system. There are the following categories of gallons according to the sizes that are being used in recent times:
1. Imperial system

Although there have been many systems and many definitions of the gallon, imperial system, and US dry and fluid system. The imperial system for gallons is mostly applied and used in the countries of the UK.

If the gallon is measured in pounds, then it comes out to be nearly 10.0 pounds that are about 4.54 kg water at the temperature 62.0 °F.

Fluid ounce is defined in the imperial system as 1/160f of one imperial gallon, when considering the quarts, there are four quarts in a gallon, one quart is equal to pints, and 20.0 imperial fluid oz in the single imperial pint.

Hence, the imperial gallon is defined as 4.546 liters (4.0 imperial quarts or 8.0 pints), that is used in the UK, Canada, and some other nations.
2. United States Liquid Gallon

The US gallon is defined as 3.785 liters that is equal to 231.0 cubic inches. This is approximately equal to 4 United States liquid quarts and 8.0 liquid pints. The symbol for gallon according to IEEE is the gal. The imperial gallon is ponderous than the US than that of U.S. gallon.

Single Imperial gallon is approximately equal to 1.20 united states liquid gallons. While the definition of US liquid gallon is 231.0 cubic inches that is equivalent to 3,785 liters.

As the property of liquid, the liquids expand at certain temperatures and contracts at some other temperature. To use the gallon as a measure of the unit, one should ignore the that expansion and contraction at the specific temperature.
US gallon in pounds

There are nearly 8.35 pounds and when converted to kilograms, it becomes 3.780 kg in a US liquid Gallon at 62 Fahrenheit or 16.66 Celsius.

According to the calculations, the imperial gallon comes out to be 16.60% heavier than the US liquid Gallon.
It can further be explained by following conversions: 
One gallon = 4.0 quarts

One quart = 2.0 pints

One pint = 16 US fluid oz

One US fluid oz = 1/128 of US liquid gallon
For example
The volume of petroleum articles and alcoholic beverages are both cited to 15.60 °C in government rules.
3. United states Dry Gallon

One US dry Gallon is 8th part of a united states Winchester bushel measurement scale of 2150.4 cubic inches. After conversion, it becomes equal to the 268.80 cubic inches.

It is approximately equal to 4.40 liters and not so commonly adapted by commerce. Most of the uses of dry gallons are in the agriculture fields, e.g. to measure the fruits like grapes.

Traditionally, dry gallon measure is utilized to measure the volumes of grains, fruits, or some other dry substances and hence the name dry gallon.

Although the united states gallon is used as a unit of measurement by few American countries yet it’s not considered as an official or standard tool of measurement.

People in most European countries are more inclined to use the measure in liters instead of US gallons or imperial gallons. Only some countries at the border of the USA like Canada have some interest in using the gallons as a unit of measurement.
There are some conversions of a gallon to the liters:

One US liquid gallon = 3.79 Litres

One US dry gallon = 4.405 litres

One UK Gallon = 4.55 litres
Thus by following the above conversions, you can calculate the volume in liters to the gallons.
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Relationship of different units
1. Quarts and gallon
Four quarters of a gallon (referred to as quarts) constitute a US liquid gallon or majestic gallon.
2. Quart, Pint, and Glass
One quart is equal to two pints and one pint is further equal to two glass. Although these converted values can also be used generally the whole container is used as a unit of measure instead of split units.
3. Gill and ounces
If further converted into smaller units, one magnificent gill is divisible into 5 liquid ounces and one U.S. gill is equal to the four liquid ounces.
4. Ounce and Gallon
Hence, a majestic liquid oz is equivalent to the 20th part of a royal 16.0 oz and 160th part of a magnificent gallon. Moreover, a United States liquid oz is equal to the 16th part of a liquid half quart or 128th part of a U.S. Gallon.
5. Fifths and Gallon
In America, the measure of alcohol is graduated in “fifths” and these fifths are approximately 5th part of a US Gallon. Here is a onestep mathematical formula to convert the liters into gallon:
Gallon = 0.2642 × Liters
To convert the volume of fluids from the liters to the gallons, one has to simply multiply the volume in liters to the conversion value and the result will be there.
One liter is the 0.2642nd part of a gallon, so if the volume in liters is multiplied with this value, it will be converted to the gallons.
In short
A US liquid gallon is equal to 4 quarters/quarts, eight pints (1 quart = 2 pints), 16 glass (1 pint = 2 glass) and 32 gills (1 glass = 2 gills).
Number of water bottles that make a gallon

One may want to know that how many water bottles make a gallon? Before coming to the number of jugs in the gallon, one should know that the volume of a gallon of water is 120 oz.

So, if you want to calculate the number of liters that you will consume if you drink a gallon per day, the conversions in Table.1 will surely help you.

By those conversions, you will be able to calculate the number of bottles or jugs that constitute a gallon.
For calculating the different gallons, you can use the following details as a guideline:

To better know the number of bottles that make the gallon, one should be clear about the aspect that the number of bottles to fill a gallon depends upon the size of the gallon.

For example, a gallon has a volume of 128 fluid oz, so to get an answer about the number of bottles in that 128fluid oz, one has to divide the oz of the bottle by 128.
For instance

If you consider the water bottle that has a volume of 16 Oz, then by dividing 128 by 16, you will come to know that 8 bottles of 16 fluid Oz are being used to fill a gallon of 128 US fluid oz (128/16 = 8).

Now, if you consider a water bottle with 32 fluid ounce volume, you will be needing just 4 bottles to fill the gallon (128/32 = 4).

Normally, a oneliter bottle consists of a volume of 33.80 Oz, so, you will require only 3.80 bottles of one liter to make up a gallon.
How many 2liter bottles make up the gallon?
 Now, if we consider a twoliter bottle to fill a gallon, we should know that as 33.80 Oz makes up a oneliter bottle, double of this amount will constitute a 2liter bottle. Fluid ounces in a twoliter bottle are 67.628 and 1.8925 of these twoliter bottles will make up a gallon.
1. Imperial gallon
 However, these calculations are for U.S. liquid gallons and US liquid gallons differ from that of the Imperial gallons. One Imperial gallon is equivalent to 4.55 liters as compared to the US gallon that is 3.79 liters.
2. Liter and gallon
 No matter in which part of the world, liters have the same volume and their volume does not differ according to the countries. in short, one liter is equivalent to the 0.26th part of US gallon and 0219th part of an imperial gallon.
Number of 5 liters bottles to make up the gallon
To calculate the number of fiveliter bottles to make up the gallon, one should follow the given conversions.
For US gallons
One US gallons = 3.785 litres
To calculate the number of 5liter bottles to make up the gallon, you should multiply 0.757 with the 5 liters (3.785/5 = 0.757). It means that a 5liter bottle is 0.757th part of a gallon.
0.757 multiplied by 5 (5 stands for 5 liters) = 3.785 (vol of gallon)
So, there are 0.757 bottles to make up the US liquid gallon of volume 3.785 liters.
For imperial gallons

One Imperial gallon consists of 4.546 liters. So, to calculate the number of 5liter bottles to make up the gallon, you should multiply 0.909 with 5 (4.546/5 = 0.909), while 5 means the 5liter bottle.

There are 0.909 bottles having 5Liter volume required to make up the imperial gallon of 4.546 liters.
Number of bottles of wine to make up the gallon
If the volume of a bottle of wine is 0.750 liters that are commonly used, to make up the gallon of 5.047 liters, there will be a need of approximately 5 bottles to make up the gallon.
How many 16.9oz Bottles in a Gallon?

Leaving the ounces, fluid ounces, or milliliters back, we are now heading towards the bigger volume. In the United States, a gallon is considered as an imperial unit for the measurement of volume.

If we consider the 16.9oz bottle to calculate that how many 16.9 ounce in a gallon, the 16.9 oz bottle is taken as 500 milliliters when converting in the units of the metric system. It has previously been mentioned that one US liquid gallon is equal to 128 fluid oz.

Therefore, if we wish to calculate that how many bottles of water make a gallon, we will just divide the 128 (fluid oz for a gallon) by 16.9 (volume of the bottle).

It will come out to be 7.573 bottles of water are required to make up the gallon. Because there is no availability of a 7.573liter bottle, so for the ease of measurement we can consider it to be 8. It means that we need approximately 8 water bottles to make up the gallon.

So, after all these discussions, if a person wants to calculate that how many bottles of water with 16.9 oz volume should he/she drink to equal a gallon per day, here is the short and sweet answer.

You should drink 8 bottles having 16.9 oz volume to drink a gallon of water each day.
According to the U.K standards

As far as the U.K standards for a gallon are concerned, one U.K liquid gallon is equal to the 160fluid ounce in contrast to the US gallon that consists of 128 fluid oz.

Now, 160 fluid oz when converted to the liters, it comes out to be 4.546 liters of fluid in a U.K gallon. So, there will be a need for 9.467 bottles of 16.9 fluid oz to make up the gallon of 160 oz (160/16.9 = 9.467).

Normally, people utilize the gallon in order to carry a significant amount of liquid. But you might face a situation where you will need a gallon of water without a rightly measured container for filling a gallon.

In cases similar to this, you will have to weigh the volume of water in fluid oz or maybe in liters.
How many cups in 16.9 oz?
16.9 ounce is approximately equal to 500 ml and to calculate that how many cups are there in 16.9 oz, we should simply divide 16.9 by 8. One ounce is equal to 0.125 cups and there are 2.115 cups in 16.0 ounces. Calculations can be done in following way:
16.9 / 8.0 = 2.1125 cups
There are the values of different units for US measurement system and the Imperial measurement system that are equal to 16.9 ounces;
1. US measurement system
Measuring unit  Ounces  

One US cup  2.112  
1 US Gallon  0.132  
1 US Liquid Pint  1.056  
1 US Liquid Quart  0.528  
1 US Legal Cup  2.082  
1 US Tablespoon  33.80  
1 US Teaspoon  101.40  
One liter  0.40  
1 milli liter  499.8 
2. Imperial measurement system
Here are the conversions from the Imperial measurement system to 16.9 ounces:
Measuring unit  Ounces  

1 Imperial Gallon  0.11  
1 Imperial Quart  0.44  
1 Imperial Pint  0.88  
1 Imperial Cup  1.76  
1 Imperial Fluid Ounce  17.6  
1 Imperial Tablespoon  28.144  
1 Imperial Teaspoon  84.433 
Comparison of a gallon
In different regions, there is a difference in the sizes of bottles. So, to calculate the amount of water in one gallon according to all of these presently used systems, there should be a proper way.
There are some conversions to calculate the number of different containers in the one gallon of different regions:
Gallons  Ounces  Containers 

1 US Gallon (128 oz)  4.0  32 bottles 
1 US Gallon (128 oz)  8.0  16 bottles 
1 US Gallon (128 oz)  16.00  8 containers 
1 US Gallon (128 oz)  16.9  7.573 bottles 
1 U. K gallon (160 oz)  4.0  40 bottles 
1 U. K (160 oz)  8.0  20 bottles 
1 U. K (160 oz)  16  10 containers 
1 U. K (160 oz)  16.9  9.467 bottles 
See also
How many 16.9 oz bottles of water equal a gallon?
How much water should you drink a day?
5. How many water bottles should you drink a day?

Water is such an essential component of life that no one can survive without it. Water acts as an antioxidant and has many positive effects on health. You may wonder that how many water bottles should you drink a day, you can follow the given detail.

Normally, 16.9 fluid ounce bottles are used in a regular routine. If a person consumes 4 bottles of 16.9 fluid ounce, that will be enough to maintain the homeostasis. Water has some amazing effects on skin.
Frequently asked questions
There are so many relevant questions that pop up in the mind while considering the bottles and ounces. Some of them have been answered briefly in this section:
1. How many 600ml water bottles make up a gallon?

As there are two units of measurement for the capacity of a gallon. US gallon consists of a 128fluidounces that is 3.785 liters. For a US gallon, there will be a requirement of 6.30 bottles of 600 ml.

A U. K gallon has a volume of 160 fluid ounces that is equal to 4.546 liters. To fill a U. K gallon, you will need 7.576 bottles with a volume of 600 ml.
2. How many 16.9 oz bottles make up a gallon?
16.9 oz is approximately equal to 500 ml. The number of bottles to make up the gallons of different regions have been explained below:

One US gallon = 128 ounce

One bottle = 16.9 oz

Number of bottles to make up a US gallon = 128/16.9 = 7.573 bottles
One U. K gallon is equal to 160 ounces. The number of bottles for 160 oz gallon can be calculated as:

One U.K Gallon = 160 oz

One bottle = 16.9 oz

Number of bottles to make up a U.K bottle = 160/ 16.9 = 9.467
3. How much is 600 ml of liquid in ounces?
600 ml of liquid is converted into ounces in the following way. 600 ml is divided by 29.573 to convert it into ounces. When the division is made the answer comes out to be 20.288.
 600ml/ 29.573 = 20.288 ounces
4. How many 16.9 ounce bottles of water make up the gallon?
A regularly used bottle has a volume of 16.9 ounces that is approximately 500ml. So, to calculate that how many 16.9 oz bottles of water equals a gallon, conversions can be made by giving away:
 One US gallon makes 128 ounces, by dividing 128 ounces by 16.9 oz (volume of the bottle) the number of bottles to make up the gallon can be calculated.
128 oz/16.9 = 7.573 bottles
 One U.K gallon that makes up 160 ounces and to calculate the number of bottles to make up the U.K gallon, 160 is divided by 16.9 ounces.
160 oz/ 16.9 = 9.467 bottles
5. How many water bottles makeup one liter?
16.9 fluid ounce water is approximately equal to 500 ml. 500 ml is half of 1 liter (1000 ml). So, to make up one liter, we will require two bottles of 16.9 fluid ounce.
Conclusion

How many water bottles make up a gallon? is the most frequently asked question. There are two types of gallons used in various regions worldwide and the measurements are taken according to them.

One US gallon constitutes 128 fluid ounces and 7.573 bottles of 16.9 ounces are needed to make up the gallon. As 7.573 is not a proper unit so it is considered to be 8.

One U.K Gallon consists of 160 fluid ounces and 9.467 bottles of 16.9 ounces are required to fill a U.K gallon.
References
 https://www.asknumbers.com/literstoounces.aspx#:~:text=there%20are%202%20water%20bottles%20of%2016.9%20oz%20in%20a%20liter
 https://yohandry.com/health/howmanybottlesofwaterareinagallon/
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