If you got it in a pack put it in a thermos.
Consider a hydration pouch. You will stay hydrated and will intake more fluids.
I am guessing you wear a pack, so get a bladder that comes with an insulated pouch and an insulator condom on the tube. There are times when the mouth piece can freeze up, (temps in the teens)but a little gnawing will loosen it up and keep it flowing.
-Pray for snow, us PNW'ers need to each do our own voodoo chant to lure the precip in with some cold temps.