I have had plants that do not do well at all on distilled or R/O water, however, using the same water with a tab or three of Hyland's Bioplasma (cell salts) every month or two and they seem to perk right up...
I am still in live experimental stages here as I have only been making DW for the last two months, but this is very interesting.
I believe the distilled R/O water with the added cell salts produce better results than the tap water; most likely due to the chemical additives to the tap water, fluoride, chloride, aluminum etc.