Some captains provide drinks, snacks, and even lunch on their charters. You can see if snacks and drinks are included in the price of your trip on the charter listing page by scrolling down to the Trip Includes section and seeing if Snacks and Drinks are checked.
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What do I bring if they aren't included?
When drinks and snacks are not included, feel free to bring a small cooler for your lunch and beverages. Note that for safety reasons captains usually don't allow glass on board, so bringing drinks in cans or plastic bottles is advised.