Mine might be an odd choice. My BOB (bug out bag) is mostly designed to survive and thrive after a short term natural disaster, along with one other person, for 3 days.
It also gives me the ability to improvise and extend things, to fish and trap and filter water while staying on the move. I think, though, that it's more likely that I'll have to use my supplies immediately after a fire or a hurricane until emergency management agencies can start providing aid to my area. In the event that I will be surviving in an "urban" setting like New Orleans after hurricane Katrina, I decided to include a stove in my kit along with fire making materials. After much deliberation, I settled on a knock off of the folding esbit stove and hexamine tablets. It's great for both ultralight camping and survival use.
It wasn't my first choice. Originally, I bought the Coleman Perfect Flow Single Burner Propane Stove. Propane tanks are everywhere. Similar, butane stoves are some of the most popular backpacking stoves. The choice seemed like a no brainer!
They offer consistent performance in various weather conditions and allow for real cooking by controlling the flow of the gas. I figured this stove and a lightweight mess kit would let me do more than boil water and that seemed like a good thing, if I had to start setting snares and foraging. The propane stove can even be used with the largest propane tanks that are made for BBQ grills (with an adapter). How cool is that?! There's a fascination among survivalist with using the supplies left behind after a disaster, and there's something alluring about hooking a burner up to a propane grill to cook real food in a post-apocalyptic wasteland. Unfortunately, the small, green propane tanks are made of steel and that makes them HEAVY. They're almost bulletproof compared to backpacking butane tanks, but lugging that around along with all of the other essentials means I have to make uncomfortable sacrifices. The burner itself is over a pound and the whole system is over two pounds with the fuel tank. I decided, after a while, that water was more essential to life than propane. For true survival, it is not worth the purchase. I still use it for camping and backpacking. In fact, I love it and I don't regret the purchase at all... but only when I'm not worried about finding a water source.