Another piece among thousands in recent decades that showcases our cultural belief that 'survival' in times of major change has mostly to do with buying the right products and/or having the right 'stuff'.
Good luck with that.
And then there's the massive implicit assumptions of socio-economic privilege involved in most everything suggested here.
Community is primary - build community first, and most, because that is what our society is by far the most lacking. And, what primarily gets us through periods of increased uncertainty and change. And it can't be bought, online or otherwise.
Without being part of resilient community, we will just each be waiting to see who runs out of bullets first, or who's most skilled at combat with sharp and/or blunt objects, or which local bully/tyrant has the least bad-tasting shoes.