According to this About.com Drinking Water article, I take my weight in pounds, divide it by two, and that's the number of ounces of water per day that I need to drink. I weigh around 106 pounds, so that's 53 ounces of water. I need to drink about seven cups of water a day.
... Yeah, I don't drink anywhere near that amount. I need to really try to do that.
MayoClinic: How much water should you drink every day?
One thing I've been doing is drinking more hot tea. When I have a cup of hot something-or-other in front of me, I drink it before it goes cold. When I have a cup of cold water in front of me, it can sit there for hours and I'll barely touch it. So drinking tea helps me get closer to my goal of 7 cups of water a day.
Do you have any tricks you use to drink more water?