Wrika is saying that he only drinks 2 liters, but that's the recommended amount for someone who is sedentary. I'm very active everyday and taking creatine, not to mention i'm a fairly large guy to begin with. I'm pretty sure I require more and the sources I've read say 8 ounces for every 10 lbs of body weight. Imma stick with that because when I drink less I do get dehydration headaches. It's not uncommon and there are sources all over the internet if he cares to verify as well as sources verifying that creatine does increase heartburn.
Hugh. When you are exercising you should drink water every 10 or so minutes, that's why you drink the water...if you drink water during exercise then you are already making up for it.
The idea that you need to drink a whole lot of water, is if you are a sports guy. What i mean by sports guy, is a football player, a cyclist, whatever. Guys that burn so much in cardio, but they drink water during the exercises!
Anyway, normal person should drink about 1.5 liters. Regarding the creatine, i don't ever feel dehydrated, so i'm gonna take that into account that when i drink 2 lts of water a day, + all the water that comes in the good and mixed with the protein shake, that i'm drinking about 2.5 lts a day, which is more than enough.
I don't know how much creatine you are taking in though, standard creatine is crap in that you have loading phases and whatnot, and overall you are taking 6 to 8 pills a day, it holds a lot of water, you get bloated etc.
One i take, 2 pills 30 minutes before workout, one 60 min after workout, it's done. It doesn't make sense to drink all that water if you aren't using it, but i don't know how much cardio you do.