I think water is VERY important for keeping your organs healthy (skin included) and flushing toxins out of our systems.

I think 64oz, apx 2 quarts or just under 2 liters is a good measure to keep as a minimum.

But.. I really judge how much water I need by the color of my urine. Some days it is clear after 7 -8oz glasses.. sometimes it takes 11 or 12 -8oz glasses. I guess it depends on what I eat.
I don't make myself drink a certain oz amount per se, but make sure that my urine is clear before bed.

Carina