How come we never run out of water if everyone uses it?
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Most school children learn about [the water cycle](https://en.wikipedia.org/wiki/Water_cycle) at some point, so that’s what you need to research. You drink tap water, you pee it out, it evaporates and forms a cloud, it rains down somewhere, we collect the rainwater into reservoirs and treat it so it’s safe to drink, your tap water comes from those reservoirs.
TL;DR is that the water doesn’t just disappear when it’s used, it changes state (solid/liquid/gas) or location (Antarctica, rain clouds, underground) and may be impure (mixed with coffee, polluted with acid, combined with human waste). While the water is always around, it’s not necessarily in a usable form or location. So “running out of water” isn’t really a problem, “running out of usable water” definitely is if we use it faster than the water cycle can replenish it so we have enough potable water where we need it.
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