Apologies, you are correct, I'm mixing it up with another cruiseline. Too many cruises this year so far if you can have such a thing 😊 Princess also say you can bring cans of soft drinks on too.
I'm pretty sure the word Whisk(e)y on a bottle will just be a red flag once you board. A lot depends on where you board, Southampton security generally aren't interested in any bottles, just looking for other prohibited items. I've walked on with 6 bottles of wine in a carrier no problem, but got called back to security when my case had a small Sgian Dubh in it (Scottish dress small knife for your sock).