To have fire you must have three things. Fuel, heat and oxygen. The easiest to get is the oxygen as it is in the air around us. Fuel is second as usually there is fuel available anywhere there are trees or brush. It is the heat part that can be the gotcha in a survival situation.
Baylite Ferro Rod 1/2" x 5" XL
Holtzman Gorilla Ferro Rod Fire Starter