A little closer to home, I'll take organic food scraps. Especially eggshells once we have the chickens and (I can hear the phrase "be careful what you wish for" echoing in my head as I type this) coffee grinds. I'll come up with a list of the most useful plants that don't seem to already be available here.
Any student at the Xavier or Jean Grey schools will have fairly heavy training in survival with and without powers so mutants would be a good pick to look for camping supplies.