What about distillation?
I bought my counter top distiller in 1982 when I first learned i was expecting a baby.
I have turned it on every single night since July of 1982 to have 4 gallons of fresh distilled water by morning to cook/drink. The workhorse of a machine is American made, all stainless parts and has never failed -- not once.
The water has been tested by a certified 3rd party and it is incredibly clean and sweet tasting. And while it does use energy...it doesn't waste water.
I recommend distillation and wonder why this consideration was not included in your review.
jtk