I haven't read the article, but just glanced at it and the main point of Mercola on that, I believe, is that distilled water is "dead". Well, vitamins are dead and minerals are dead in the same line of thoughts.
Dr Mercola was also against fasting for many years, only to change his opinion lately.
This guy, Andrew Norton, talks about it, (including the infamous "Distilled water causes early death" - article, which is PAID for to always appear in the first page of a Google search) in a lay manner, but really close to what I feel about the greatness of distilled: https://www.youtube.com/watch?v=qTtMDbMYnGM