"RO or Distilled water is the only way to go."

Well maybe if you want to add a bunch of stuff to replace the micronutes. Technically either should not have any minerals at all, just pure water. Plants require those minerals and it is very important to replace them or the plant will suffer very slowly and not give much indication if illness until very, very sick. I use tap water pH'd to 6-6.5 and I don't worry about chlorine or chloramines.