https://en.m.wikipedia.org/wiki/Xeriscaping
My step-father did have a well installed for the lone purpose of maintaining the lawn.
It is also a backup supply if the municipal system becomes unavailable.
Also, I do find it odd to water plants with water treated with chlorine and fluoride.
I just researched sugar water for fresh cut flowers. The article actually suggested what seemed to be a substantial amount of chlorine bleach (I think a half-teaspoon per liter) to reduce bacteria and mold, so there are some positive aspects to strong oxidants. (.. and at least the plants will have strong teeth and bones.)
EDIT: found a similar article: https://homeguides.sfgate.com/sugar-bleach-really-make-flowe...