I use the 4 liter MSR Dromedary as a water bladder. It can take some punishment, and I can hang it up around camp if desired. Also carry a 1 liter bottle for drink mix.
Hate the idea of carrying water inside my pack (where it could leak). I use 2x medium carabiners along one long edge of the bladder, clip those around the front straps for the multi-lid on my Unaweep.. Route the drink tube, strap down the lid.. Water is up high, gravity fed, and still outside my pack in case of leaks...