I have seen some interesting ideas for preppers in this topic.
Preppers need food which keeps, and need to think laterally.
Rich fruit cake, with plenty of sugar, and perhaps soaked in brandy, keeps indefinitely. Sugar and alcohol dries bacteria to husks. Cakes in tins stacked to the rafters.
Chocolate, plenty of fat and sugar. It may be necessary to use military chocolate, to keep well. I hear that emergency rations in lifeboats during WW2 were sometimes fortified chocolate, which is with vitamins added.
Plenty of multi vitamin tablets.
Sacks of dried beans.
Some people have raised the old chestnut of preparing for hunting. (Do Americans use that term for an old fallacy?) Such people have no idea of population carrying capacity. Before white settlement, there were perhaps 3 million First Nation peoples in what is now the US, that is one percent of the current population. Hunting does not support the current population; only farming can do that.
Another old chestnut is suspicion of the Federal government. Thomas Hobbes, a seventeenth century political philosopher, pointed out that in a state of nature ‘life is nasty, brutish and short’. Governments usually overcome that problem, first by local warlords, then a paramount warlord known as a king, or more recently a president. Governments keep order in their territory; that is what government are for.
I come from Australia, a first world country. If international supply of food and oil becomes a problem, first world countries have the option of seizing food and oil from poor countries. On a less brutal note, the US, Canada and Australia are large grain exporters. Poor harvests mean that less is exported, so that the domestic population gets what it needs at the expense of importing countries. There were poor wheat harvests in the US and Russia in 2008, which caused a sharp rise in prices in the Middle East which imports a lot of wheat. I hear that Russia temporarily stopped all export of wheat in 2008 until it became clear that Russia had enough wheat for its own needs.
Another option, for the US, is to reduce grain feeding of cattle. A kilogram of beef takes many kilograms of corn, so rationing of beef is one option for the US government. At the start of rationing, there will be a surplus of cattle in feed lots, so there would be a once only ration of beef at the start of rationing.