I think I'm right in stating the Cliff Notes version is to use Arrowhead Spring water. (I do.) (Someone will correct me if I'm wrong...)
NOTE: I just glanced at the "insanely long water FAQ" & no mention of Arrowhead Spring water.
"IF YOU DON'T EVER WANT TO MESS WITH THIS STUFF Use Volvic or Crystal Geyser Natural Alpine water in your home espresso machine. They have formulations that won't scale, but which still taste OK for coffee. On the other hand, if you want to take some pains and save some money, read on.
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