You don't need to be drinking fruit juice - it's too high in sugar.
Some people can drink limited amounts of skim milk and still diet succesfully but water is the way to go.
If you need to shake it up a bit because the thought of water makes you sick add some splenda and lemon.
Try green tea - there are dozens of green teas on the market and it's good for you - and you may even start to enjoy drinking it cold.
I drink a gallon or more of water per day and I've gotten everyone in my office drinking more water and toting around liters of water everywhere they go.
I have this 32 ounce bottle I bought at Gallon's and I probably fill it up at least 4 times a day, it's a good thing I have a bathroom right by my cube.
I might try adding some splenda and some lemon juice that sounds pretty good.
Hey, if y'all want a bad-ass unbreakable, temperature-resistant water bottle, go to http://www.nalgene-outdoor.com/ Ive got one of their 32-oz narrow top bottles, and I cug about 4 of those suckers a day; you can fill it with water, freeze it, and the hard plastic wont break. They rock!