Ferment organic matter free of heavy metals which is not easy to do. Aluminum is the most abundant metal element (about 8%) and the 3rd most abundant after oxygen and silica in the earths crust. Finding clean sources is key.

@Hydro-Hippie a 48 hour soak for compost tea is going to smoke all the aerobic organisms. “ORGANIC” is a mis leading buzz word. Most things are organic. Gasoline is organic for Christ’s sake. I think what you’re actually looking for would be a “natural” or “minimally processed” fertilizers.