Many folks are familiar with making beer or wine at home. Making alcohol fuel is the next step. The process is simple, distilling the “beer” made from fermented sugars. Drinking alcohol has quite a bit of water in it. For fuel, we want a almost water free product, in excess of 160 proof. The process is energy intensive, especially if you have to convert starches to sugar first, so using waste heat, or solar could mitigate your energy inputs, and produce a less expensive fuel. There are a lot of sugar bearing crops, like beets, corn, and even tree sap. Ethanol can even be made from wood waste like sawdust. There’s one outfit that makes vodka from maple sap, so it’s doable. Waste food sources like stale donuts have even been used.
If you are interested in making your own fuel, I suggest the following information: