Depending on your plans, you are always advised to make basic shopping before arriving to the base or after the check-in procedure. Please note that before the check-in procedure is done on boat, you are not allowed to bring your luggage or groceries on boat.
While sailing you will probably moor on some of the island, and you must know that most of the villages and cities on the islands have shops and small markets, so we recommend you buy fresh local food.