On the KC-135s you used it all. You NEEDED it all. 120 seconds and you had gone through 5600lbs of water.
On the YS-11 with water/meth, after you were safely airborne, you turned off the water/meth and saved it for the next takeoff. You never got high enough to worry about ambient temps freezing the solution.
Seems like I remember also we had different water/meth solutions. It was not a standard x/x% mix.
When the airplanes left the pax fleets, the freight haulers immediately yanked out the pressurization system along with the water meth system, IIRC. Neither needed to haul boxes at night.