Unfortunately we do not make fluoride reduction filters for the Sport Berkey® . Fluoride is very difficult to extract once it has been introduced into the water supply and it requires a large amount of media to remove just a small amount of fluoride. Currently, it would require that most of the room within the sport bottle be used for a fluoride filter leaving next to no room for the source water. Until a more powerful media is developed,  it would be unfeasible  for us to develop a fluoride reduction filter for the Sport Berkey®. We do, however, make fluoride reduction filters for our larger systems because we have more room with which to work.