128 fluid ounces=16 cups=8 pints=4 quarts=1 galon.
You lose, according to two sources I've recently bumped into, 80 to 96 fluid ounces of water a day due to normal activity, which need to be replaced through fluid consumption. You can do the math to figure out that this comes to a paltry half- to three-fourths-gallon of water a day you're supposed to drink. Let's say five eights, or 5 pints.
Assuming 1 pint to be .5 liters, this means you oughta be drinking about about 2.5 liters. A medium soda bottle and then a little soda bottle full of water every day. No Problem, says I. I've had almost that much already, and it's only 11am.
How's my math? I'm damn tired, so I'm sorry if I'm off a bit.