Rain/ tap water have never caused me any ill effects, that dosent mean it's not a possibiolity though. But alo of indicas I've worked with do grow anywhere from a light to a deep purpe color on the leaves, so thats likely a genetic trait. As for the red, I have seen many pistils that turn a deep red color, is the red mainly on the pistils? Otherwise it's probably a phenotype encouraged by the origional breeder, or a nutrient deficiency.