Any 0 calorie non caffeine water source is the best -- I drink a gallon of crystal light or herb tea (red zinger or lemon zinger) a day, plus one cup of coffee in the morning.
It's better to get fluids in, then to not get enough because you have don't like water.
Also adding low calorie soups to your daily intake increases your fluids, and helps curb your appetite too. Cucumbers and watermelon are low calories and nutritious ways to get fluids also.
"It's just food. If you stop giving up your power to the food and take control of the choices you have to make you can succeed."