Yeah, I’ll stockpile a box or three of N-95 masks when they’re back in stock at Home Depot.  Meantime, I’ll make do with what I have available. 
Today while shopping I wore one of my neck gators with a very fine, tight weave.  It was designed to protect your throat and lungs during dust-storms (again, bought to wear during wildfires), but these days it helps me with my virtue signaling while shopping.  A simple mask (scarf/bandana/ neck gator) combined with social distancing (which I really like, but then I’m a solo walker/hiker) should afford you the isolation you need.  That, and local LE will apparently start enforcing the State’s stay-at-home orders.  I’ll stop there, more and I’d go all political...