It’s actually nothing in water that we need.
Rather – as you may remember from chemistry class – if you just have two solid chemical powders and you sit them next to each other, nothing will happen. You have to dissolve them in water before they start reacting with each other.
That’s why the body needs water: not to use, like, the oxygen and hydrogen in water itself, but to use it as a solvent for all the biochemical reactions that take place in the body.
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