Can you bring your own cup on a Carnival cruise? You are allowed to bring your own personal cup, such as a Yeti cup, or reusable water bottle on a Carnival cruise. Any size is fine and you can use it to drink whatever you like.
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Had no problem bringing aboard contigo or stainless steel bottles on board. While they were empty on embarkation, they had water in them when we returned from shore excursions and no one had any issues.
In that case, you can order a 12-pack of bottled water to be delivered to your cabin for about $10. That's much easier than carrying it on with you. Carnival policy: 12 cans/cartons (12 ounces or less) per person are allowed.
Guests may also bring non-alcoholic beverages as carry-on items on boarding day. Non-alcoholic beverages may not exceed 12 standard (17 oz.) cans, bottles or cartons per stateroom. Milk and distilled water brought on for infant, medical, or dietary use are permitted.
Available in abundance for free on all Carnival cruise ships are the following: What is this? There are beverage stations all around the cruise ship. For sure, you can get water any time.