I did some more searching and found that modern flamethrowers used for controlled burns very often use an 80/20 diesel/gasoline mixture. Since biodiesel is not that difficult to produce given the ability to press oil from seeds and produce some methanol, all you need to do is find some crude to crack or some other source of lightweight hydrocarbons to make the gasoline to keep on flaming your enemies. You might have a problem with running out of ignitors. Maybe go with a DIY engineered spark ignitor or some kind of pilot flame that you can trigger to a jet to ignite the fuel.
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