I bought an electric water distiller. ≈5 ppm in the water after distillation, so essentially nothing. I wanted a way to reliably remove fluoride.
Discussion
How long does it take, what’s the starting amount of water & loss rate?
I’m not sure about loss there is only a “full” line in the tank, no measurement. But it takes ≈ 4 hours to distill a little over a gallon of water.