What a tremendous success story! As said before, a map like this could be made for Starbucks, McDonald's, the number of people who have a PC that runs Windows or Apple and on and one.
The simplest, easiest tent shelter I ever set up was a rope and tarp. Of course we had trees to tie the ropes to, so in a post-apocalyptic world there might not be any trees to tie the rope to.
I hope a good chunk of these people survive any catastrophic-apocalyptic destruction our world encounters in the future. If they do, then the new world will be a better place than it is now.