Why is that water is needed to live as opposed to alternative liquids? If coffee is just bean-flavoured water, why couldn’t you survive by only drinking coffee? If you were lost on a desert island and had only coffee, juice or soda to drink, could you survive?
People who say you have to drink X amount of plain water per day are wrong. Any liquid that is water-based: coffee, tea, soda, etc. (as opposed to a liquid like cooking oil) is fine to keep you hydrated.
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