make your own off the grid fuel (now and later)

free fuel after the apocalypse (and before) using pyrolysis

this process has enough scope or latitude in it to work under many conditions

process dry biomass (wood,leaves,agricultural waste,tumbleweeds,etc) that would rot anyway

result is biogas that you can use in bbq, vehicle, generator, gas refrigerator, etc

here is a link to diagrams and explanations:
Making biofuel using pyrolysis

you shouldn't do this in your living room, better to do it far outside

don't be a danger to yourself and others

will need some experimentation to make it more optimal

safety first, live to gas yourself another day