Please don't take offense at Lisa's response. There have been SOOOOO many threads that begin with someone asking a question similar to yours that degenerate into "the many ways to break the rules" that we have taken the stance to close the topics as soon as they arrive. There are already many on this board that can be found with a simple search.
Yes, she answered abruplty, but it has become our stock response to this question as most of the time the poster is not looking for the "legal" ways of getting liquor into their cabins.
But the bar set up is the best way and despite the cost, it does save money over buying all your drinks from the bars.
Carnival Cruise Lines:
Fantasy 90, Celebration 95, Victory 05, Conquest 05, Spirit 6/06, Freedom 6/08, Holiday 7/08, Victory 6/09, Valor 9/09, Dream 6/10, Splendor 8/10,Conquest 8/11,Magic 11/11,Triumph 4/12,Spirit 7/12,Freedom 11/12, Triumph 2/13 - The fire cruise
NCL Dream October 2006, RCCL Mariner OTS June 2007, Celebrity Silhouette 2013