I've heard the Hooah! Energy Bar (developed by the military) isn't too bad, but haven't personally tried. Available at a couple of mainstream outlets, including Wal-Mart and GNC stores. Click on "About the Bar" at bottom of their web page for detailed info.

sure it makes you thirsty, but just about everything does, and I forgot to mention those Mainstay lifeboat bars too, I have some of them also. Even though I haven't tried them, I understand you need to wash those down too.

I discussed much of this in 2 of 3 car kits

Near the bottom is a section on food.

I also talk about Tuna candles and buddy burners. These are an ideal heat source when trapped in a car. They supply an amazing amount of heat. While stuck in a blizzard they might not warm the place up like home but but even with the window cracked for ventilation [ and you better do so unless you want to die] they wiil keep you from becoming apopsicle. Both also generate enough heat to cook with. Unlike regular candles they are very hard to tip over reducing the fire hazzard. Also because of the can even if they burn down to the bottom they won't start a fire because they are contained. Although you should put something between the seats and the can. It will get hot enough toi melt plastic seat covers.

As to jerky. Make your own. That way you control the amount of salt. While it can't be eliminated it can be greatly reduced over commercial brands. Besides that way you can tailor it to your specific tastes. The use a seal-a-meal type deal to pack it for long term storage. Another good choice for winter use is pemican. Not its not the healthest foods but supplies about as many calories in the smallest package. That is what you need to keep the fire stoked in a winter survival situation. Again you can tweek the recipe to meet your desires better. I have also seen recipes that substitute peanut butter for suet. So peanut butter is also a good stand alone product. It is little affected by by cycling temps.

But all foods have a shelf life. Remember to use old products and replace them befor it runs out. The temperature changes that can be faced in a car will probable shorten them in the extreme. Figure generally keeping them only for a single season or a year atmost.