There are currently about 7 billion people on the planet, all of which require water to survive. Even without the direct consumption of water, water is usually in most other beverages that people consume. Also, many of these billions of humans use massive amounts of water everyday to do laundry, bathe, wash dishes, and so forth. Many animals require water to survive as well.
Also, humans and animals requiring frequent water consumption has been a thing for billions of years. Obviosuly Earth’s water supply is not infinite. How have we not already exhausted all the water the Earth has to offer?
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Matter is conserved. All the water we drink eventually is breathed out, peed out, or otherwise re-enters the environment, such as if you die and are either buried or cremated.
It’s possible to split water into oxygen and hydrogen by electrolysis, but this takes a huge amount of energy and organisms don’t do this naturally. Oxygen and hydrogen of course can be turned back into water, but since hydrogen is so light it rises up and some of it is lost to outer space.
This doesn’t destroy it for good (matter is still conserved), but it would make it very difficult to undo.
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