On my last cruise I took my friends soda container to have it filled for her, and was asked for my card. I told the bartender I was just haven't it filled for my friend--and was denied. It seems they're watching the soda thing a little closer than before. I've seen some people pour soda into another container and go back for the second fill. At least two people didn't have to go up to the bar. While having lunch in the windjammer, they usually don't ask for the card, they just take your container and fill it for you.