I have finally found a source of ZSM-5.... But it is $300 a kilogram. I'm trying to decide how much I want it.
It is a compound with a very interesting ability - it will turn methanol and/or ethanol to a mixture of heptane and octane. Basically, you make alcohol, cook it with this, and it becomes gasoline.
Of course, it does need to be cooked at about 250-300 degrees Celcius, and requires a reactor to do that little bit of magic in; it's not out-and-out magic, but it's close.
If you're a raider or a right-wing survivalist, a hippy or a would-be technocrat, this is why you need science and engineering people. Even if you create a monastery for them, you need to protect them. We can do some magical things.