I can't even use filtered water in the city where I live, this water is so bad, we received a letter some time ago, telling everyone not to drink the water, but it is not safe, so we went to a store, ans purchased a filter, to attach to the kitchen faucet, it lasted 2 weeks, so we went going to the grocery store, and bought bottled water.
the only water that will not leave a while ring in my canning pot, is distilled water. During the day, I drink the small bottles of water, because my brother thinks it is terrible, that I was making coffee, and iced tea with distilled water. Just the other day, I boiled some spring water, in a pan, and I still got a terrible ring in the pan, and this was spring water. I will clean out the the inside of my nice  new Keurig Coffee Brewer, but how often should I clean it out, using distilled water?
Thank You Bunches!!