Agree with all of the items you mention as potential barter items. Saw one on a survivalist board awhile back which makes some sense......a few bottle of Jack Daniels.
I wasn't trying to make an exhaustive list but just mentioned some of the items that immediately came to mind.
Booze should have come to mind. I drank more than my share years ago and don't drink now, but alcoholic beverages would make a very good barter item.
I haven't priced any lately, but I am guessing that one could buy cases of relatively cheap vodka or whiskey and the stuff would last forever. One would have to protect it from breakage and theft. I wonder if pint bottles would be the most effective "denomination"?
Besides, that goes well with the “eat (or drink) what you store” philosphy.