How does water's rate of use and renewal limit its availability?

Water is a limited resource, despite it being very useful. We still use it very often because there is a bountiful amount of it, but it is not abundant, obviously we have enough to last you and I, but we will eventually run out. If anything, it'll become rarer and increase in price, but I have a feeling we will either find water somewhere else, or die out before then.

The answer is During the time it takes for water to replenish, use can outstrip supply (Apex)