we've done a number of charters, including BVI. We focus on having breakfast items, lunch items, snacks and beverages, plus plan about 3 dinners on board during a week's charter. One dinner is usually omelettes and salad (using up the eggs). We bring things like coffee/tea/sugar/crackers/cookies/tuna/cereal with us from home, and use the "a la carte" page on the charter company's provisioning list, to pick and choose only the items we want. (cold cuts/cheese/yogurt/fruit, etc). Go out for dinner. On a few nights, grill
chicken/burgers/pork tenderloin on board, with rice pilaf or couscous (boxes we bring from home) and salad or veg. Keep it simple with the onboard cooking... you're on vacation! I am not a big fan of grocery stores when on vacation, so I like having the a la carte items delivered to boat. When trying to decide amounts of things, less is more. You can always add to what you bought, and usually there will be stuff left over at the end of the charter. We get creative the last day or so, using up what is left. Everyone's tastes and habits are different, but think about how you eat on your boat when weekend cruising at home and go from there.