What Scott said sounds about right to me. Just one additional comment though
is that, depending on where you live, you can find the CO2 cartriges just
about anywhere. They use the same cartriges to fill BB or Pellet guns but I
think they are cheapest in grocery stores, if you can find them, or pehaps a
specialty store for food/cooking of some type. I personally don't think
carbonated water tastes much like canned club soda but give it a go and see
what you think, it would probably be good with whiskey. Cheers
--
Interested in custom handmade knives? Check out my fathers site at
http://www.mrcalifornia.com/~hjensen
He would be happy to work with you on creating the perfect knife
to meet your needs.