If you need a mask and you can't sew, this might help. 
http://blog.japanesecreations.com/no-sew-face-mask-with-handkerchief-and-hair-tie

Why not just wear a bandanna? This fits on your face more snugly, and you'll see that it has more layers. 

How am I supposed to get an 18" square of fabric? Dude, if I can cut up a pair of pajama pants, you can cut up an old t-shirt or a pillow case. 

I put away my sewing rig for now, I was tired of having it take up the entire living room. It's streamlined now and I brought it up to my office. I'm still obsessed with watching mask tutorials, though: the idea of making something flat into something three dimensional and useful continually astonishes me.