Have to be one big mother of an EMP to affect the entire US. And a lot of military stuff is hardened, or stored in hardened areas.

Ok, so no electricity. Call it camping. Bullets will still work, so I am not grabbing a sword and armor a la' SM Sterling.

Would be a problem for food depending on when it hit. Frankly, late summer early fall after the harvest is in would be best, let it rot in silos.

Am I gonna lie away tonight worrying about this? Nope. Falls under the "if it happens, we are SOL" category.