If for some reason you haven't already done it and have a set of 2 batches waiting, go brew two batches of beer. If you don't know how to brew beer, go search the Internet there's tons of information on it out there, and while the initial equipment cost is kinda' high, a normal batch for me comes out to around $0.50 to $0.75 a glass. Compare that to the cost of most 6 packs and realize that what your making with home brew is typically higher quality, and is going to taste better than most store bought beer and it's a clear win. Plus it's great bragging rights when someone comes over and is enjoying a glass and wants to know where you bought it. Plus if you're on Instuctables I kinda' figure you for a do-it-yourself-er anyway.
Normally when home brewing you go from the primary or secondary fermenter to a bottling bucket with some priming sugar in it to get the beer carbonated over the a 1-2 week period. With a keg system you can instead just transfer the beer to the keg, force carbonate and enjoy.