My daughter is also sewing cloth mask using a pattern from https://www.craftpassion.com/face-mask-sewing-pattern/
I know these aren't as good, but they probably improve my chances of avoiding SARS-CoV-2 by at least 10% when I have to go outside. I plan on using them once, then leaving them in a bucket in the garage. Once I've used them all up, I'll wash them and by that time (and hopefully the detergent + bleach action), the virus will be dead.