There are several hydration fanny packs available.
For shorter runs, I use an MSR XOOM (no longer sold, unfortunately). I also have a Golite Hare, which is a little larger than the XOOM, but doesn't ride quite as well (on me).
Camelback offers 3 fanny packs with bladders in varying sizes: Alterra, Catalyst, and FlashFlo.
There are probably others; these are just the ones I'm familiar with. You can also make your own. Just find a fanny pack you like and add a Platypus Hoser or MSR hydration kit.