What you get in your mini bar has nothing to do with your room. That's one of the great things about Couples, everyone is treated the same no matter what room you book. If you are a Romance Rewards Member, you can pre-order for your mini bar. Just go to the romance rewards page and there is a link on the left side bar to preregister. Don't log in until you get to the preregistration page.
If it's the same selection as CN, you get full liter bottles of vodka, rum, scotch, and gin. Full bottles of red, white, and sparkling wine. Cans of Carib beer or Miller Lite upon request. Plus Pepsi, Diet Pepsi, Ting, and ginger ale. You can also get a variety of juices, like orange, cranberry, & pineapple. Tonic and soda water are also available.