I had first found out about drinking very large amounts of CLEAN water (filtered or purified) in a really old issue of MM2K. Anyway, since then, i have adapted to drinking never under a gallon a day. You know what, I use the bathroom a lot more but my skin always looks clear, my food digests better, i dont retain water like i used to after a high sodium meal, no dark circles under my eyes, i could go on and on. Don't be afraid to drink lots of water, the excess will only be excreted, you wont gain nothing more than a few minutes worth of water weight. And, when i say i drink water, i mean water, not mixed in with any kind of flavoring or drink. Think about the kind of favor you're doing your kidneys. My urine is never yellow, always clear or almost clear. Water is the forgotten nutrient.