I've made an Altbier from a kit (extract w/ specialty grains - my second batch of homebrew) and have had it in secondary at a lower temperature for about two weeks ( in the garage in MN) and intend to keep it there another week- ten days before bottling - when I bottle will I need to add yeast - I've dropped the temp to around 35F - I'll bring it in for a few days to let it warm up - will the yeast there be viable enough to carbonate or should I add more and if so how much?