Just going to walk in to work and refuse outright to wear a mask. I have a voice recorder that I plan on bringing with as well. I'm going to start doing my job without a mask, refuse to wear one, and tell them to give me a written letter of termination otherwise.
EDIT: Guys, prayers worked, SCOTUS didn't completely betray us all
Tell them exactly why you are refusing, stating it is against your human rights or whatever. Find something valid. That way you hold more weight when suing since they were knowledgeable about what they were doing wrong.