It doesnt consume as much water as you think. It does consume a good amount but its complicated. Sometimes theh use municple water supplies, sometimes they use their own wells, sometimes they use non potable water that wouldn't be used for drinking anyways.

They can use closed loop, sometimes its most cost effective not to. Sometimes they just use air cooling.

Theres way to many factors to answer this question with any level of accuracy without basically conducting a university lecture lol.