That's a bit of a pipe dream. It's better for people to just stay at home as much as possible. Everyone can do that regardless of the availability of masks.
People need to stay home, but they also need to go to the grocery store, bank, or other essential activities. When they do, they should be wearing a mask.
You can make your own from a piece of clothe - there are thousands of people doing just that all over Europe, making masks for themselves, their family and friends.
