Food security
I think one of the best things anyone can do to prepare for extended future disasters like is to plant perennial food crops in their yards and on vacant land. Nut trees are especially good, including chestnuts, hickories, oaks, and for more southern areas, pecans and almonds, as these can provide protein in a fairly easy to store form. Chestnuts especially grow quickly and bear early (7 to 10 years), although the nuts don't keep as well and are largely carbs. People can get most of their yearly calories from them though, as they can be dried and ground into flour (which doesn't have gluten), so plant chestnuts! The best yields and largest nuts are from Chinese chestnuts or hybrids, the sweetest taste from American chestnuts, but they (American) are currently still extremely vulnerable to blight, which doesn't much bother the Chinese. Maybe plant one of each, as chestnuts need another tree for pollination anyway, and then there will be a local source for others who want to start their own trees. I intend to post more on this community on other food plants if I get a good response or questions on this post, so if you want to know more from someone who has spent WAY too much time learning about this stuff, ask away...:)