Here's instructions on how to make your own shoes. I realize that almost everybody will not have the materials, so you'll have to improvise. Like the materials to form your feet, you'll have to use mad or clay, etc.. Seems a little complicated to me. I keep my old shoes, even if they are well worn, I store them in the crawl space above the garage.

Make Your Own Shoes at Home!
https://www.instructables.com/id/Make-Your-Own-Shoes-at-Home/
This is an instructable for making your own pair of shoes with materials you can buy in an art store or a fabric store. I base my technique off of traditional shoe making methods, but you won't need expensive materials, a nice set up, or complex tools.
This method will also create perfectly fitting shoes as the pattern will be drawn from your own feet!
The total cost of this project is less than $50 and, will take under 20 hours. ---CONTINUED---