No grocery stores. probably no electricity for your lights, stove, fridge, dishwasher, and washing machine and dryer. No microwaves or cell phones. No way to make roads or cars.
I used to mention that to my JW friends when they were busy picking out their new mansions. They didn't want to listen to those things.
Few knew how to make bread or preserves. Few knew how to grow vegetables.
And what about those appliances they were so used to. Who was going to make them? Who knew how to grow grain and thresh it and turn it into flour?
Who knew how to grow cotton or shear sheep and the process to make wool and turn the cotton or wool onto something that would make material? Who knew how to make clothes? By hand! No sewing machine or spindles or looms unless you made them yourself.
And no internet to learn how to do any of those things
As a Witness I made sure I knew a lot of those things. I was going to be ready.