To my understanding, water has no nutritional value. It has nothing in it. It’s simply just water.
That said, why is it so crucial to life?
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If you were going to chose a liquid to base life around it would be water it’s the best solvent and forms polar bonds which are a nice mix of covalent and ionic. The atoms that make it are hydrogen which has the highest energy density and oxygen which is one of the most available oxidizing agents. They interact in interesting ways with carbon which is pretty much the atom you would base life around given a choice because of the different ways it can bond to itself. However probably the main reason is the life you know evolved on a planet with liquid water. It would be no surprise if life coming from planets with ammonia seas was ammonia based.
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