How do you keep the Gatorade and water from exploding when they freeze if this was for a car, or was this comment for Amtrak travel? I have heard of opening up drinks and pouring some out to leave headroom for expansion...This is exactly it. I keep protein bars, sugar-free Gatorade, and water rolled up in a winter-rated sleeping bag and then wrap a blanket around the sleeping bag. I also have a shovel and a small container of salt that works in frigid temps.
And if you run out of water, you can always grab some snow.