Before I left there were a lot of questions about sneaking alcohol aboard...Well my wife, brother in law, and I were succesful doing so...We bought a bottle of vodka and two bottles of rum in Miami before we boarded and put them in freezer baggies (tripled bagged) and stuck them in our suitcases and they were delivered safe and sound to our room with no issues....
Heres a hint that works for me I get small water bottles that fit in my shoes and put my booze in the bottles and then in the shoes. The shoes hide the bottles from the scanners and protects the bottles from breaking at the same time. But you must hide the bottles when they are in your rooms the room stewards are suppose to report any booze that is in the rooms since to new alcohol policy on RCCL. we just hide it in the one of the drawers.
I pack a couple of litres in my checked suitcase wrapped in t-shirts I am taking anyway. I have never had a bottle break. Check my bag at the pier and it has always arrived just fine in my cabin. On our last cruise (Aug. 2006) we stopped at the liquor store and grocery on the way from the airport to the pier. (New TSA rules) We purchased liquor and water and soft drinks. Checked the water and soft drinks with our bags at the pier and all arrived in our cabin intact. Saves $$$ on water and didn't have to buy the soft drink card. Put a couple bottles in my shoulder bag and passed through security and on to the ship.
I have a wine box that was made to handle airline travel. It holds 12 bottles that we take from our home cellar. Most cruise lines allow wine and will charge you (or not) a corkage fee if you take them to dinner in the dining room. Allows us to enjoy fine wine at a much lower actual cost.
No need to fill mouthwash / water bottles.
I always leave my liquor bottles on the counter in the cabin and order glassware from room service. Have never had a problem....not once.
Regal Princess 1996
Sun Princess 1998
Grand Princess 2000
Ocean Princess 2001
Golden Princess 2004
Caribbeean Princess 2004
Caribbean Princess 2006
I have been getting the impression that due to some of the problems on RCI with the disappearance of some passengers while onboard, the carry on alcohol restrictions have become highly enforced. I have even heard that they scan the suitcases for the the shape of the bottle, and confiscate it that way. This is why everyone is trying to be "creative".