-It is vital that our bodies receive the right amount  of clean water every day.
-Reverse osmosis filters have been known to remove essential minerals from  the water and therefore are not the preferred choice as a filter.
-Fluoride Filters are one option as good filters.

Here is a quick search result of Fluoride Filters:
*Berkey Big Water Filter-2 Black Filters And 2 Pf-2 Fluoride Filters
CDN$ 334.00
*Classic Fit 2 PK Replacement Filter for BRITA pitcher
The Berkey PF-2