As a rule the following drinks are free.
Coffee, tea, ice tea, some juices in the morning for breakfast.
There is a charge for soft drinks and alcohol, and note everything in the refrigerator in your cabin has a charge including the water.
Here is a link to a guide to drinks on a cruise.
There is a new trend with cruise lines offer a free beverage package included in their fares. These offers are limited and used by the cruise line for promotions. Subscribe to our website and you will receive these offers when they posted by the cruise lines.