For a great thread OP.
One thing you need to be aware of is temperature. High temps play havoc with 'use by' dates.
We've had canned goods (ie in metal containers) go bad well within their printed use-by dates, even Spam and corned beef.
Tinned fish is one of the worst offenders.
Powdered milk goes rancid within a few weeks, as can vege oils (less of a problem here as we've got wall to wall olive trees.) Cartons - (fruit juices, milk, esp vegetable milks) are a waste of time, need to be used same as fresh.
We'e experimenting with older methods of preservation (with help and guidance from a couple of very gnarly old Greeks, lol).
Salt drying, sun drying and preserving in oil & or brine liquids seem to be effective, if time consuming.
One of daid Greeks has dry-preserved a shed-load (literally) of hams and is currently teaching me how to preserve hides (stinky business, ugh).
Good luck with your preps OP - and everyone else!!
This thread should be PINED!!