I use the Nathan handheld water bottle. I have used this up to 26.2 miles and I like using it. I won't use a belt around my waist as I can see where it would get VERY ANNOYING to have the water sloshing around, etc. Not to mention, it gets in the way of where I swing my arms.
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather, to skid in broadside thoroughly used-up, totally worn out, and loudly proclaiming: WOW WHAT A RIDE!!!!"