I agree about lacto bacillus and Teraganix EM-1. This stuff is cool because you can use it right out of the bottle, or add 1 cup EM-1 and 1 cup of molasses to a gallon of water and brew up a new Gallon. And from there you can continue the process forever and not have to buy anymore.
A company called SCD Probiotics makes a knock off product (BioAg) a little cheaper on Amazon if you want to save a few bucks.