I tell mine to bring climate appropriate clothing. I let them know that when their provisions run out they're hitting the road to go get more. If they ran out of food, the women and children can stay but the men are going out foraging. Don't come back empty handed... Also bring the standard clothing and, shoes, boots, gloves, hats
ll the fuel they can (and I'd put this above bedding since we have extra). Gas, diesel, kero & propane.
If they have children, I'd ask them to bring appropriate entertainment or whatever they need to keep their kid(s) happy. Don't bring anything electronic as we may not have power. Books, games, cards, crafts...
Any cooking items made of cast iron. No such thing as too much, especially once you add the extra mouths that need fed.
HABA (Health And Beauty Aids) Soaps, deodorant, toothbrush and such.
Disinfectants and anti-bacterial items (Lysol, hand cleaners, etc.)
Some utility items. Tarps, siphon hoses, lighters, flashlights, batteries, rope and such.