Drinks can get real expensive on the boat, especially since they give you a card to pay for everything. They really get you with that because you don't realize how much your spending until you get your bill. To minimize your booze bill I would suggest the following.
When you are at port, get a big water bottle (1 liter or larger).
get a large bottle of vodka or rum or any other clear alcohol.
Drink or dump water out of water bottle and refill with booze.
Carry booze back on to ship and it appears that you are just bringing water on board.
This worked like a charm when I was on a cruise. I just brought a 7/11 super big gulp travel mug with me. I think you can pay to get all you can drink pop while you're on the boat. So just fill up with booze and top off with your favorite mix and you're good to go.
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