No offense taken!!! I love that you caught the term "soda card". To me it is POP, but I try to catch myself whenever possible.
Actually, Royal Caribbean terms it a "Soda/Juice Package", but I believe you are correct, RCI serves coca-cola products, so what comes out the "fountains" at the bar are coke products.
The alcohol package is offered to groups and whomever is organizing and booking the group has the ability to request this package. The downside to this is that RCI requires that it be an all or nothing package - meaning that everyone in the group must purchase the package, which is perhaps why you are unaware of it.