Here in Ohio, I have not had problems so far with water freezing in my car, that said, my car does spend winter nights in a garage, if it were outside all night, my water pouches might freeze. As far as food, I stick mainly with beef jerky, mre breads, crackers and mre cheese spreads [all of which are nearly impossible to find right now due to hurricane relief] and candy bars, which are no big deal if they freeze, many like them frozen in the summertime anyway. Sometimes carry pop tarts as well [but in the heavier style vending packages, not the thin foil in the grocery stores] you can usually find the vending style packages in some of the stores like GFS [gordon food service] if you have any of those in your area.