I am using CO2 for storage. You can get these little, I think they call them pony bottles very cheap. Will fill a lot of pails. The regulators can be expensive, ask if they have any used or check out E Bay or Craigslist. Restaurant supplies sometimes has the whole set up used as well. I then use this setup for my fridge to the right which is a 4 tap Rootbeer making machine. No yeast to fuss with. Normally have on tap 2 root beers, sasporilla and a cherry coke.