they are not amused, if you will bring stuff on board a ship. But it is very simple: take some plastic bottles that have place in your toilet bag - noone will controll or find it... But beware of the steward! You can take wine with you, but there will be a cork charge on each bottle (up to 30 dollars, I heard)
Have a nice cruise
We just got back from Mariner in February- we brought tons of "nip" bottles. We put them in my husbands socks and some flask size bottles in his shoes with socks stuffed inside- all in our luggage, not carry on, had no problem!