I wonder if it would be worthwhile to include a 12v hot pot or immersion heater, that way don't have to get out of the car to heat liquids.
I've thought of this, too. In fact, this is one of the reasons I bought an immersion heater. This does mean we are assuming the car is functional enough to power the heater. I think it's a good idea to have a backup, so that's why I'm looking at the camping stove thread carefully.