Tap water here is too iffy, Chloramines, fluoride, etc. I try to collect rain water, when not available I use RO, because that's what I drink (easy to add sea salt for minerals), you really don't want fluoride in your diet, contributes to all kinds of problems, especially thyroid, tends to drive hypothyroid, and lower IQ in the young (Harvard study).
Good for nothing, definitely not your teeth, but really great at causing a host of sub-clinical problems that Big Pharma would be happy to treat but not cure. Sorry I know this is one of those things people disagree about, but there is info out there from respected studies proving it does nothing at best. At worst fluorosis, cancer, hypothroidism, etc.
Anyway, off soap box. I use Dyna-Gro Foliage Pro and Protekt way diluted, in whatever growing medium I'm using, at about 1/4tsp of each per gallon.