@cicerone imposter,
Depends on the season and varies in relation to how much coffee and/or tea I drink.
In the coming months, I will definitely drink far more. AT least, I will drink my entire 1.5 liter water bottle in an entire day. Not including various teas, coffees, and if I filled my glass water jug I keep at work. I think if I was to guess an atypical day of extreme drinking? Maybe 3 liters of straight water (not tea or coffee) or slightly more. But we're talking particularly hot, crappy days.
Drinking plenty of water is good for the skin, kidney health, and keeping your bowel situation ... chugging along? It does... I just don't feel comfortable discussing that part of reality.