It wouldnt be a bad idea to keep a little non perishable food and water in your vehicle, along with a weapon. A full out contingency bag is a little extreme, but if you are out in the country and get stuck or run off the road and get lost or whatever, a small stach of supplies is always good to have around. So a small backpack with some food and essential equipment(knife, food, pot(for the food, not for smoking
), firestarter, etc) wouldnt be a bad idea, but I sure wouldnt get too crazy with it. It would suck if you were in a wreck and all your gear was destroyed.