I don't know of any process other than distillation, at least anything that's not very expensive.
The sodium fluoride molecule bonds so completely with the water molecule that it's almost impossible short of distillation to remove it. SFS isn't some big gangly thing hanging off of a water molecule, quite the contrary it is extremely small and due to its opposite charge it bores its way deep within the water molecule and hangs on like a tick.
When water is boiled and then distilled, the sodium fluoride is part of what remains as the white-ish residue in the bottom of the heating vessel -- along with residual minerals including the heavy metals added within sodium-flurosilicate "product" that is added at the water works.
Distilled water is always your best bet. if, you add some liquid colloidal mineral concentrate with trace minerals to it... you can get these from your health food store. Add about 30 to 40 drops of minerals per gallon of distilled water.
It is advertised that a five stage reverse osmosis filtration system will also strip the fluoride from a water molecule ... these things are slow, and really pricey though, as are the replacement filters ...
Coyoté"The right of civilians in a free society to possess "military-looking,"
or even actual military weapons, is essential if a monopoly of force
is not to reside in the hands of government, where modern history
shows the potential for far greater abuses and crimes exists than
are possible for any deranged individual." ~U.S. Supreme Court
Aymette v. State, 21 Tenn. Reports 154 (1840)
cited in U.S. v. Miller, 307 U.S. 174 (1939)