Yes, I believe that any of the bar drinks are extra. Pop and basic juices are free. The meals are free, and you can have as many dishes as you want! Keep in mind though that you will get pretty full even just having one of each item.
We did ask for smaller soup portions at Palo which they did for us since we didn't want to be wasteful. I don't think we could have finished a whole bowl of soup so they gave us cup sized portions. It was nicer that way too since if you really liked one variety, you could also try the other kind without over doing it.
I think they charge about $5 US for a virgin Pina Colada in Parrot Cay.