FAQ of the Week: How much water does a cat need?

I pulled this question which was buried in reader comments a few weeks ago:
How much water does a large cat need to drink? I know they do need water, but haven't been able to learn exactly how much.

Since water is such an important need for cats, it needs a more detailed reply than a one-liner referring to a specific quantity. In fact, I am expanding my section on water for cats, and will add even more information at a later date. Read my Reply

My cats love their water, especially from a flowing fountain.
_{Photo Credit: © Franny Syufy}