I hate carrying things, and I hate wearing things. But. Sometimes you can't plan your entire route around water fountains in the parks. So I bought an Amphipod water bottle belt. It's not the easiest thing to use, but I can carry 32 oz of water. It doesn't slosh. I shove the belt as low as possible on my hips. It also has a pouch, making it easier to carry beans, bloks, or gels.

For runs < 5 miles, I plan around the water fountains. Alas, those will soon be turned off for the winter.