Drink cards are only for individual glasses of soda in bars, lounges and restaurant. I only drink club soda, and would assume this is included. But be sure to ask when you register at embarkation. If you like bottled water, buy some ashore and bring it to your cabin. Your steward will provide ice. As I recall, there's a charge of $2.00 for a big bottle of Evian -- but it may be more now.