look into building a keezer, wont damage the freezer
as far as the earlier question. one 5# co2 tank will do, and if you are doing all 3 kegs at same psi, then one reg off the co2 tank will work, and grab a 4 way manifold.
that sucks, and just happened to me as well. i found the leak, fixed it. forced it at 30psi at 40F for 24, was ready to drink...i shook up the keg every hour too. its doable!