Congradulations on your anniversary and cruise, and welcome to cruise-chat. While all cruiselines have different guidelines, stowing alcohol in a different bottle, a very sturdy one, has a goood chance of getting onboard. Most cruise lines will take any alcohol bought in port and give it to you the last night to pack. I carry a 2 liter coffee cup with top when I board, fill it with a couple bottles of rum or baileys, and have no problem. Same in the ports. As for declaring, they say 2 bottles each, max. But I have never been stopped by authorities yet, and pack as much as a dozen bottles. Hope this helps!