I had discussed this with a friend,of whom works at The Poop Soup Plant(Hyperion Treatment Plant).He said Distillation should do the trick as,It depletes the water's ability to contain Minerals in Evaporation.I asked if Flouride is a Mineral?He said,Originally Yes,but more like a salt.He said 3-cycles of Distillation,Should do the trick you should have 99.9% pure H20! So I guess a Still would be the answer,instead of a plant base,you just use Water! Hope this helps!