How about:

Oatmeal (any unflavored type)

Dried Fruit, e.g. raisins, prunes, bananas, etc. (keeps a long time, but not forever)

Buckwheat groats (aka "Kasha"); mostly found in stores specializing in Eastern Europe foods -- it is a grain like rice, cooked in the same way. Was a staple food for most of our ancestors in Eastern Europe). It used to be a major crop in the U.S. also.

Flour and Corn meal.

Just some suggestions to add to the list.