I am in the Air Force and getting ready to deploy in a month. I still have time to brew some beer, and it would be nice to have some when I get back. Can I just make a couple of batches of beer and then leave them sealed up in the kegs in my garage until I get back? Normally, my beer doesn't last that long around my house. But I won't be back until the end of January sometime. Should I put some sugar in there to keep it carbonated like I would do if I were bottling? Thanks!