If I were to just buy distilled water, which basically has no ions in it, and add salts to it would that work as well? I have BeerSmith and it basically tells you how much salts to put in to get a desired water profile. I've never done this before, so I don't know if it really works. When do you add the salts----when your heating up your mash water?, when you add the water to the crushed grains?