A key to survival during any long-term SHTF scenario will be the ability to boil water for cooking, washing, sanitation and to make it potable if your normal water source becomes contaminated or stops working. Its easy enough to boil water on a propane stove or cooker, but once your propane runs out you are back to square one. Just for kicks and giggles I "fabricated" this little outdoor stove using nothing but a couple of large cinder-block bricks and the upper warming grill from my barbeque. For fuel I used nothing but a handful of kindling-sized scraps from an old pallet that I had laying around. I was able to get the water to a rolling boil in about 5 minutes. The beauty of using the bricks is that the holes in the sides allow for good airflow, and you can add wood to the fire as needed from the sides instead of having to remove the water and grill in order to add from the top. You can pick the bricks up almost anywhere for $2 apiece. And you can stack and arrange them as needed to make the stove bigger if you need to heat a larger volume of water in a stock pot or pressure cooker. This beats the heck out of using your woodstove because its much more efficient in terms of the amount of wood needed. Even an apartment dweller could do this in their parking lot or carport, using whatever scrap wood they can find. Cheap, low-tech, reliable and effective is the way to go if the SHTF!