Hopinso....I made a reply to the Distilled Water forum, but thought I'd add a little more here. Your Grandmother reminds me a lot of my Mother, in that they use Tap Water without concern about calcium deposits. I've tried.
I both filter and distill my water......WY
Its sad that women are told to get their calcium for bone health then are sold junk that is inorganic and the body can only utilize about 2%. Some bottled water brags about added calcium. I'll take broccoli and fruit any day.