RCI policy is no personal alcohol is allowed to be brought aboard, even on embarkation day and definitely not in the ports-of-call. No wine, no beer, no liquor. They even eyeball bottles of soda or water that you may have bought while on a tour. Perhaps the most restrictive line when it comes to this.
But as Brad said, they will keep any unused bottled wine and serve it on subsequent nights in the main dining room.