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On the Thomson cruises, you don't need to buy a soda card at $6pp pd+15% as ALL soft drinks are included in the All incusive drinks package and NO, you don't pay extra for a mixer as this is inculded in the price of the drink.
The OP is on RCI not Thomson so your answer is not very relevent is it?
There is no such thing as a drink package that includes the soft drink mixer with an alcoholic beverage....the soda card is $6pp pd+15% and that is all. When you buy a vodka and coke you only pay for the vodka anyway and not for the mixer on RCI.