A sommelier reveals why you should never put the cork back in the wine bottle. "If you put a cork cap back in a half-empty bottle, you'll see air leak into the bottle," Warner Boyne says.
Another solution is to turn the wine into ice cubes. Wine will actually freeze if you put it in a freezer, so just pour the leftover wine into a tray of ice cubes and put in the freezer. The wine cubes can be used to make various alcoholic drinks and even soups.