My understanding is that if the bottled water is labeled "reverse osmosis filtered" or "steam distilled" that very little if any of the original source water's fluoride is left. We buy some bottled water, but mostly use our home distilled water.
We got our distiller from: http://waterdistiller.com/distiller-water/
We have the Love model 3 as well as the Love model 1.
We love them.
Testing our water with a total disolved solids meter before and after distillation is shocking:
local tap water 324 PPM
home distilled tap water 1 PPM
store bought distilled water 2-5 PPM depending on brand.
Hope this helps.