Interruption in public water supply
We do keep in our basement a small supply of water for emergency use. We needed it last week. The public water supply was jeopardized when a 30 inch water main broke causing a huge sinkhole under a major street and undermining the nearby sewer as well. Water was still flowing, but a three minute boil was recommended. In the summer heat, I did not want to do that, so we used our basement supply.
Our supply is hodgepodge. I have old bleach bottles, wine bottles, vinegar bottles, a few 2L soda bottles, a purpose-made gerry can, and even some 1L isopropyl alcohol bottles. We still bathed in the public supply water, as I am normally desperate to do so after gardening in the evening. The boil water order was lifted the next day, so we got off easy.