20-24oz. Jug. I cup of sugar. I yeast packet (not expired) Warm water-95 to 115 degrees, warm to the touch. Watch the video. Then shake daily or when the balloon collapses. Throw away when balloon stops inflating. Or buy some TNB. Yeah. Ain’t got that cash. This method produces a very minimal amount of co2 but any co2 is better than none. To many for more co2 can skank up a beautiful smelling cannabis grow. But the more the better.