Here’s the takeaway: purified water has very few minerals, but that’s its job. It’s a blank canvas. If you want minerals, eat food. If you want hydration, drink the purified stuff and stop worrying.
Just don’t let anyone sell you a “mineral-boosted” bottle for ten bucks. Unless the label has a picture of a mountain and your inner hipster approves. Then go for it—but know you’re paying for the story, not the science.
TL;DR: Your teeth are safe. Your bones are safe. Your wallet, however, might not survive the marketing. Drink up and move on to more important things—like figuring out why your fridge light stays on when the door is closed.