Hospital Ice Chips
Fries with ice cream
This page can help you.
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Why do other patients give ice cubes instead of water?
The opacity of ice cubes comes primarily from minerals, not air. Cold water is low in minerals because water collects them in a closed heater. Use distilled water if you really want clean water. Sometimes you can get cheap clean water from an aquarium store.
Because they don't want you to drink too much or you can. They provide enough to keep your mouth and throat dry.