The worst has happened. Just look how hard Texas was hit by Harvey Hurricane.
Disaster has struck and you were caught flat-footed and unprepared. Or maybe you were prepared, but didn’t stockpile enough, or your supply was compromised.
For whatever reason, you go to the grocery store because you’re out of water and food but the shelves are bare. So where do you turn when you need to buy food but the grocery store shelves are empty?