Dehydrated foods and MREs can and often will cause flatulence or constipation over time. Even in a vehicle you should think about wieght. Canned foods, especially soups are largely water and heavy. If you need to carry water, carry it seperate. Vitamens can be had in so called SURVIVAL TABS, essentially multi vitamens with minerals and a few other goodies. Longterm they may be usefull. In a short term bugout situation your turning your urine yellow without knowing your specific needs. You also have to consider the salt content in foods. In all honesty, I would go to the market and buy foods you enjoy, a GOOD combination can/bottle/cap opener and think about some safe stove arrangement. All foods taste better hot. And this brings us to coffee,tea and cocoa and some cold Tang or koolaid mixes. You have taken a big step in thinking about this kit. Continue by implementing one, even if 99% of the stuff gets rotated out or improved on. It's hard to lose money on food you can actually eat and wool blankets. You have put yourself in a mindset of preparedness. This asset with a blanket, jar of peanut butter, gallon of water, matches,wool blanket and the obligatory knife tossed in the back seat puts you light years ahead of the guy inthe next lane over with his CD collection and a coke in the center console cupholder. I bet he's listening to Celine Dion's greatest hits.