Yes, it is a self-serve drink station. They offer coffee, tea, hot chocolate, water, milk and lemonade. You could also use what is there to make iced tea but I don't think they offered it pre-made. I do not remember if they offered juice at the drink station.
We found that these offerings were all that we needed (aside from the occasional adult beverage) and didn't need to purchase soda during our entire 7-day cruise. We also did not need to bring any beverages aboard with us.