I won't go out into an enclosed public place with circulated air say supermarket before my respirator comes, the other day I still met people without a mask the cashier lady didn't wear mask too, although she has a plastic screen divider on face height, most people has ran out of their disposable mask and now wearing washable cotton mask I know won't work, I can smell my coffee through it
You're still better off with the mask than nothing. If you can buy a Korean sun visor (whole face) and use the cotton mask underneath it, you've got impromptu protection.