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You can’t bring your own drinks on MSC cruises, which is different from Carnival.
Carnival allows one bottle of wine and one 12-pack of soda per person.
Sneaking alcohol on board is doable once the cruise begins, especially on port days.
You can replace water bottles with clear booze, then put it back in or I bought these Shampoo Bottle flasks from Amazon and they work great to sneak alcohol onboard.
On MSC, you’ll need to buy the soda package or cans of soda, or stick to tea/lemonade for mixing.
Bringing a Yeti cup or tumbler is a good idea for making your drinks.