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I believe the same applies to R/O water - you need to add CalMag.
Honestly, if you are growing in soil, there is almost no reason for you to not to just use tap water unless your municipal water supply is adding tons and tons of crap to it or the pH is way off. However, all of those things are easily fixed.
Things municipal water supplies typically add are:
Flouride - easy to remove with tablets that you can normally find at pet stores in the fish section
Chlorine - easily removed by simply letting the water sit in an open container for 24+ hours... it will evaporate from the water very quickly.
pH problems? pH-Up / pH-Down
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