Fuel in a survival situation is going to come in as many forms as there are needs. There is,

Wood- Nice to have a big supply if your able to stay put.olive oil lamp

Alcohol-A small bottle with a homemade stove can go a long way if your on the move.

Butane-Handy to have and can be used inside unlike propane.

Coleman Fuel-Burns hot even at subzero temperatures, easy to get.

Kerosene-Low cost needs to be used outside,Kerosene lanterns are nice

Lamp Oil-safer for indoor use

Gasoline-Lots of uses cars,generators and power equipment such as chainsaws but only when its safe to do so so as not to draw unwanted attention  because of the noise.

Many other kinds of fuels the use of which will be covered in later posts.