Our plan to keep cruising costs down is to buy fresh in bulk when items are cheap, dry the food, and then get back out to sea as quickly as possible so as to limit dock time.
How long do you plan on being away from land? week, weeks? Is this a doomsday scenario??
I understand the need for emergency food for several days to a week. That's why i like MRE's with the heater. Not dehydrated and no need for a stove. Can be made and eaten in the worst conditions. Hot food on a cold, wet day in terrible conditions.
I'm more of a social person, if i'm in town anyways i'll be looking for fresh food.