You need:
1 standard size roll of Cheap Toilet Paper
1 Coffee can the size of that roll
1 bottle of Isopropyl Alcohol
Stuff the TP into the Coffee can, and pour the bottle of alcohol in the can until the TP won't absorb anymore. Put the lid on it, and light it when you need it. To put it out, just put the lid back on. I learned this as a kid from my father, and we used them in our deer stands. It emits a low blue flame and quite a bit of heat. They don't really smell too bad, but their is a slight smell of alcohol, so you might want to just use it at camp. It never hurt our hunting while in the stand, though.