The federal government will go broke and the people money will be worthless so everything will be very expensive. Think of Germany in the 1920s/30s. It will make the Great Depression look like a picnic. Better stock up on canned goods. Lots and lots of canned goods.
Canned goods, boxes of cereal, protein bars, bottled water, and any other food with a long shelf life. Lots of ammunition too.
Those survival rations that are advertised are good too. I must look into those.