Water will keep you peeing, and enough of it will result in clear urine; however, for me and some others, it does nothing to keep you hydrated. You need fluids, yes, electrolytes, vitamin water maybe? I was using water at one time and still ended up in the hospital for dehydration.
So my thought is water to pee, flush you out, but get some kind of healthy drink in you, and I recall someone—maybe our member atraveler—listed a whole bunch of healthy drinks.
Perhaps he reads this and adds that list, because it's good stuff.