I agree with funniegrrl, and I like plain water. However, sometimes having a flavored drink will satisfy my "head hunger" and keep me from eating something I really don't need.

I like Crystal Light, but I also like a glass of water with a slice of lemon or lime in it. A lot people like a little fruit juice mixed in. If you just don't like the way your water tastes, consider some sort of filter. When I lived in Seattle, the city water was awful compared to my well at home in Alaska. I bought a Brita pitcher and it made the water palatable. Keeping water cold in the fridge also makes it taste better. Sometimes I freeze my partially filled water bottles, then add more when I take them out. They stay cold a long time.