Hmm.. Cut-Throat.. ice to Alaska.. Now
there's a proposition..!
How about lotsa potatoes, onions, peppers, eggplant, zucchini, tomatoes, broccoli.. most kinds of veg should last a week at 60°. Maybe use those perforated bags to keep them "breathing". Cheeses tightly wrapped should do ok. Rice, canned beans, pasta.
You could even make up some chili or spaghetti sauce and freeze it in blocks before hand (in case your first day's catch isn't all you'd hoped
) .. while it's defrosting it serves as "ice". Same with frozen vegetables or meats. Those should last on their own for the first coupla days if you have a good cooler and don't open it too much.
We had to leave our dog with a friend for a week and prepared a cooler with a frozen meat portion (2#) for each day. It wasn't 'til the last day or two that it all thawed out completely.
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Just thought of a couple other things: small cans of condensed milk.. eggs will keep for a week at room temp if they haven't previously been refrigerated.. butter will be ok, too.
I also found this sailing site that talks about how to deal with little/no refrigeration:
http://www.sailingbreezes.com/sailing_breezes_current/articles/may03/refrigeration.htm
Have a great trip!