I usually drink it straight up from the bottle or on the rocks!

No really, I read a couple years ago that drinking very cold water would help speed up your metabolism. Now, granted that may be all bogus crap, but I bought into it and I drink mine cold. I drink 33.8 oz (1 liter) bottles at a time and tend to get 3 1/2 in on a good day. On a bad day, I get in 2 to 3 liters.