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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There is a water cycle. In the wild, waste water from urine or other bodily fluids can evaporate and come back down as rain. In developed countries, waste water goes into a treatment plant or septic tank before evaporating or being dumped into rivers. In developing countries, waste water may go directly into rivers or be treated in some other way. But all water we usr comes back out in some form or another, where it eventually evaporates and comes back down as rain.
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