i would cut out all the survival type gear and just take what you would need untill the hiway patrol shows up..i assume your on normal roads and not way out in the "bush".
a good sleeping bag--stop at a big box store and get a family camping type bag..something to keep the car warm if your out of gas and can't run the heater--a cheap Gaz stove and a few carts of Gaz from that big box shop should do it..you can heat cans of beans or whatever on that stove. a cell phone and a flasher for the back window should bring help..i think unless you venture way off the normal roads into the mountains or into the back woods someplace that just about any road in the US has enought traffic that help should be there in a few hours.if you need to travel in bad weather just stop and shop in case you get held up one one of those clogged up freeways that people get stuck in for days..but in that case everyone knows about it and help will be there..
i should have asked this first off--where will you be driving???--here in Minnesota a coffee can survival kit was something people would carry around but now with cell phones i don't hear much about that anymore..