I have a bunch of medical ("procedure") style masks that weren't really made for medical personnel. I'd probably bring a whole bunch, mark them, and rotate through them. I wouldn't be using them like a true medical use, so it should be fine to wash them.
I've been using these styles of masks for a month (started off with a few my parents gave me that they picked up in a waiting room before the Covid-19 pandemic started) and after a while these will break but they can last a while. It started tearing where the elastic was sonic-welded to the mask. I had one slightly used 3M 8210 that I'd wear sometimes, but tossed it when the elastic broke.