Do you need a face mask? Do you have a bandana? If you said yes, to both questions, we have a solution for you. Oh, one more question. Do you have rubber bands? You will need two of those in addition to your bandana.
Note: if you don't have a bandana, you can obviously use another material.
What is the difference between a bandana and handkerchief?
What are the best protective face mask materials?
Note: a DIY face mask does NOT have the same benefits as a N95 respirator mask.