This is a popular topic. Keep reading through the threads and you'll see quite a few regarding 'sneaking' drinks on board.
There appears to be an overwhelming consensus that you'll have no problem stashing bottles of soda, wine, liquor in your checked baggage. Some people have even gotten several cases of beer on board from what I've read.
Quite a few have brought stuff on board with their carry on bags, but most use their checked luggage to get it on board.