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If you stand in line at a bar, you can get a glass of water. That's about it.
You can get water, tea, coffee at restaurants. You can get juices for breakfast at restaurants.
The buffet, when it is open (and Observation Lounge on selected ships), you can get water, coffee, tea, milk, and flavored waters.
Sodas, energy drinks, bottled water are come with a charge. Add 20% gratuities to the prices below:
Or there is specialty coffees