Many people were already wearing masks when I shopped on 03-31. Contrary to the usual guidance about colds and flu, the CDC now urges everybody to mask their nose and mouth if they must go out in public. Asymptomatic people may still carry and spread the virus.
Long ago, I sometimes needed to wear the sort of paper mask that helps in a workplace where sawdust or bits of fiberglass are in the air. I see many of them now, but I don’t have any. I recall them being uncomfortable and prone to clogging.
So I improvised with a scarf that can be pulled up over my nose, much like bandanas worn by the Lone Ranger’s foes. The pulled up scarf is tolerable and lets me breath freely. Any nastiness not caught by the scarf will go straight down. Any strangers fiddling with my belt buckle will deserve what they get.
Apart from guarding against the possibility that I might be an asymptomatic carrier, the combination of my scarf mask and sanitizer vest may make some ambient virus particles less infectious. They will see me and laugh their coronas off.