I have a pressure cooker I could pull out the safety release plug put in a flared copper tubing used in plumbing, then coil the tube as a condenser and let it drip into another container. This is my standard idea if a "nuclear event happens as well, but then I would also filter it through my Big Berkey filter too. Everyone has an old pressure cooker laying around somewhere or can stop by the thriftstore and find one thats not good for anything else.