I found i can get a complete keging system minus co2 tank for around 100. I found that you can get an adapter for paintball co2 tanks to hook into the regulator. I have a few bottles lying around a 20 12 9 oz tanks. Im wondering if i can use them for now to force carbonate the beer and to pour it. Or do i need more than 20oz to force carbonate the beer in the keg