There is nothing unique about well water. It is either hard, soft or somewhere in between. The pH is high, low or somewhere in between. The mineral content is just whatever it happens to be where you are. I am on well water that my municipality pumps and the only thing they do to it is add some chlorine. The next town over has a lake to supply water. They get a bit more variation in nitrates because farm runoff affects their lake. Other than the nitrate variation, our waters are close to the same. If I had my own well it might be harder to get the details of the mineral content of my water but otherwise, it would be coming from the same aquifer and thus the same basic water.