One thing I'd remind everyone to stock a lot of: Salt. It has many uses, from food preservation to wound care, and it's one of those things you will not be able to find in quantity once things go south.
Ditto vinegar. I like apple cider vinegar.
Also, don't forget barter booze. Buy alcohol to use for barter. Vodka is useful.
10 pounds pinto beans.
10 pounds white rice (brown & wild rice has nowhere near the shelf life)
WHITE VINEGAR*
Powdered milk
Sugar or Honey
Coffee I buy it always
Oats
Flour
Olive oil
A few of my favourite things to have 6mths in stock.. Do you agree?