• Reverse Osmosis Filtration
  This is used to purify several types of bottled water (not all), so some bottled waters are unfluoridated. Reverse osmosis systems are generally unaffordable for personal use.

• Activated Alumina Defluoridation Filter
  These filters are used in locales where fluorosis is prevalent. They are relatively expensive (lowest price I saw was $30/filter) and require frequent replacement, but do offer an option for home water filtration.

• Distillation Filtration
  There are commercially available distillation filters that can be purchased to remove fluoride from water. On a related note: When looking at bottled water, keep in mind that 'distilled water' does not imply that a product is suitable for drinking water and other undesirable impurities may be present.

These products remove everything even the natural minerals and vitamins that are in water. They are also unaffordable and must typically be plumbed into the current pipe system.