That would be an interesting find since "portable" and "flouride removal" are not typically compatible. Maybe a lifeboat reverse osmosis unit would do the trick, but that's awfully expensive.

If you can go as large as one of the Berkey models, they do make a flouride-removing PF-2 cartridge. But that needs to be used in addition to one of their standard black ones, to get the full range of water purification.

Are we talking for daily use, or just emergencies? I've never done the calculation, but you may find that finding bottled water without added flouride is more economical than fitering, even over the long term, especially if you're just concerned with drinking/cooking water, and not including bathing/showering water.