[XorNot]

I mean yeah, you adjust for perishiability. The stuff you list is already preserved though is the thing ('cept mustard, though I did eventually discover that Hot English Mustard loses it's kick after 1.5 years after the jar is open).

Anything you'd normally consider to need to be refrigerated though starts from the "when did you open it" sort of consideration though - meat and vegetables both have about a 1 week timer on them in my experience (though you'll usually know by smell in advance). But "smells okay" isn't a chance I'm going to take unless I'm in a survival situation - and you need to buy groceries weekly anyway.

What helps a ton is having a cheap chest freezer though - they're much more efficient on power, and you can store a ton of stuff in there for ages and just defrost as you go.