For a long period of time in my life I barely drank water. I drank Mountain Dew pretty much all the time (For a few years waaay back I ran the "Mountain Dew Crew" here on NewGrounds. hah. what?). I would be drinking literally at least a 2-liter a day. It was unruly. About a year ago I decided I had to cut back, both as a method to lose some weight and for my teeth's sake (I already did quite a bit of damage there, unfortunately).
But I'm still hopelessly addicted to cold carbonated beverages. I made a compromise, I now drink bottles of carbonated flavored water. No sugar, no calories, etc. etc. etc. I'm sure it's not quite as healthy as straight-up water but it has to be leaps and bounds from a 2-liter of Dew a day, heh. It's delicious and cheap, too!
So if you're counting that I drink about a liter (at least) of water every day.