ZZ,
They have tuna (and other meats) in a bag now, seasoned, precooked and ready for meals. That's high engery, hi protein yummy and it stores flat and small. Canned meats like spam and vienna susages are also good, sardines and such if you have the taste. Just because you are 'camping' doesn't mean you have to eat like a camper.
A huge bag of mixed greens (salad) and dressing wouldn't hurt either and would keep for days on board.
Keep in mind you'll be able to refill - but you need enough water on board for 2 days or so - 10 gallons would not be too much in reserve.
As to cooking - a small camp stove with a 2lb bulb of propane takes almost no space and is worth it. Velco the bulb to a stanchion if you worry about it leaking (it can't if not connected to the stove). Cook in the cockpit and you have hot food, easily enough.
If you need a place to crash in Annapolis call or PM
