All the do-gooders will tell you you can't and it's not allowed.
When I cruise, I don't try to hide anything. I do like to have a drink in my room while waiting for the lovely wife to get ready for dinner, etc.
So I just pack the bottle just the way it comes from the store, no disguising, no putting it in other bottles.I wrap it in bubble wrap and between a few towels. Never had any problem.
Just go, enjoy and do what your heart desires.
Oh, by the way, I drink Crown which has a very distinctive shape and no one has confiscated it. And if they do, so be it.