Hey! I have one of these, in a nice light blue.

I started riding again after a long, long absence so I haven't gone past 2 hours yet. For anything shorter than 2 hours, I used to fill the camelb'k with water. Anything longer? Definitely an energy drink (pick your favorite) - ala gatorade, powerade, whatever. I'll do the same once I go past 2 hours in a single ride, which should be real soon

The extra calories (for me anyway) in energy drinks, really helped on longer rides where you have to stay vigilant of your calorie intake to avoid bonking~