Yes, its true, many do bring soda onboard. Most of the cruiselines are trying to discourage it these days. From what I'm reading, you can bring a 6 pack or two, but not cases...Keep it light and hopefully, you won't have a problem.
We usually bring a 12 pack or two with us. I leave them in their carton and place them at the bottom of my suitcase. (as if it were standing up) I have never had any issues with handling, nor with them removing it.
Mariner of the Seas 3/30/08
"Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines. Sail away from the safe harbor. Catch the trade winds in your sails. Explore. Dream. Discover."
We always bring a carry on size, rolling type suitcase full of sodas, Pelligreno (sparkling water) and snacks with us. We buy the plastic bottles and put them in extra large baggies. We then wrap a towel or jacket around them to keep them from moving around.
After we use the stuff inside then that suitcase serves as our souveneirs suitcase when we go home.
This works out very well for us and we have never been had a problem. That's one trip with NCL and three trips with Carnival. We're gonna try it out next time with Princess.
We don't drink alcohol so I really can't say if that would make a difference. It might.
a couple of things to think about - if you are flying, some of the airlines are charging for that extra bag, plus if you go over the weight limit you will have to pay for that also, soda has been known to explode while in flight due to the pressure changes.
If you are planning on buying your soda once you arrive in port then you can usually bring aboard a couple of 6-packs of soda that the cruise line doesn't carry.