Most of the time while day hunting I don't carry a bladder at all, just a filter bottle on my waist belt. Water in my area is very plentiful, clean & pure, so I just tank up where & when I can.
For long backpack in hunts, I'll use a 2L Camelback Hydrostorm set up w/ a sawyer mini, and a 10L Dromedary dirty water gravity filter/shower bag at camp.
Oh and I carry a couple/three 1L Platy bottles, usually full of whiskey that I later use as clean water bottles for camp or pack. Really like those 1L Platy bottles, handy little things.
Hunt'nFish