1. Obtain refined cellulose fibers
2. Add cellulase to break down the cellulose into sugars
3. Add yeast, or other fungi/bacteria/enzyme that converts sugars into ethanol
4. Heat the concoction at 79 degrees under 1 bar pressure to extract the ethanol by evaporation
5. The ethanol gas will travel from the mix via a tube to a different recipient where it will accumulate in liquid form
6. Add water to dilute it as much as you want.
WARNING:This creates a volatile mix of pressurized gases, do NOT make this unless you know exactly what you're messing with, risk of explosion and poisoning. Make in a well ventilated place.