I'd like to store some emergency rations & water - something like the Datrex stuff - in my car, but the temperature extremes seem problematic. Has anyone found rations & water rated for temperatures found in a car? I'm thinking of heat degrading the food & repeated freezing rupturing the water storage.

The motive for this thinking: I have 30 days of rations at home that can be quickly put in the car for an emergency evac or whatever. But I spend a lot of each week not at home and there's a good chance the call to run will come while away from home, possibly with no way to stop by home before heading for the hills. I already keep a "toolbox" crate in the car of everything I might need during evac & at civilized shelter, except the big ones: food & water.

My Honda Odyssey has large door pockets and there's room amongst other supplies for a couple of day's food & water there, and another week or two in the back.