Not in the realm of entertainment, but comfort for you and sanity for your cook.
Boric acid for safe bug control. Mix with sugar to make a syrup for ants and other crawly critters. Some dollar store have it relatively cheap.
Diatomaceous earth, food grade used for deworming dogs and cats, as well as for use in chicken houses. Be rid of bed bugs, fleas, ants, roaches, parasites. Sprinkle around your foundation for whole house control. Used widely to keep bugs from invading stored grain and beans.
Neither of these item should ever go bad, but you will be seen as an angel if you have a supply of these after the SHTF.
Check!