Check out this explosive video tutorial on how to make napalm. What is napalm? Napalm is a highly flammable tacky jelly used in incendiary bombs and flamethrowers and other weapon items, made of gasoline thickened with special soaps.
All you do is soak some styrofoam up in gasoline. That's it. Grab some styrofoam packing peanuts and soak it in a fuel of your choice, like gas. Let it dissolve until it won't dissolve anymore. Then, you have napalm.