That is a good question. Reverse osmosis should remove it, if it is a good system.

Are the bottled water people adding it to the water, who knows. Would they tell you? It should be labeled on the bottle if they fluoridated the water I believe.

I have a good filter that removes fluoride hooked up to my refrigerator, so my ice cubes and water are flouride free. I dont like drinking out of plastic bottles, they say they is bad for you also. Micro plastics.