Came across these a few days ago. No idea if they are effective, but could be a good way to heat food.
http://www.barocook.net/eng/product/product.asp?productNo=1002
http://www.barocook.net/eng/product/product.asp?productNo=1002
In the UK a vehicle BoB has a high chance of being used when you are trapped in the vehicle due to snow. So things that allow you to function within the vehicle would be useful.
At risk of making assumptions, if you're planning proportions for 2 people, I'm guessing good odds that at least 1 of those is going to be female. So I would go with something like these to make things easier. Ditto the bags with the funky crystals to absorb the contents... Sorry, not the most glamorous of subjects.
Oh, and based on the rest of the list - More water (2L per person per day), and the ability to warm up something, even if it's just soup or tea will be a great boost for morale.
Consider some sort of large saw as well, something you can use to clear a fallen tree on a blocked road. Maybe some good rope, to go with it.
J