Maybe this is not the most practical idea and maybe I just want a cool way of dispensing my homemade brew, but I think I will give it a go anyway. I agree that a 2-liter of beer does not go a long way but if this system worked than I could use it with a gallon jug or something. I am just not ready to go all out into a kegging system because of one, the money, and two, the ease of transporting my beer.
I think what I will do is use the plans from those websites, hope that it works, and get a co2 injector to pump my already carbonated beer out the top.
Thanks for the feedback