A used Milli-Q system (makes ultra-pure deionized water for scientific research) is only a few hundred bucks on ebay. Mind you, drinking water deionized to suc

A used Milli-Q system (makes ultra-pure deionized water for scientific research) is only a few hundred bucks on ebay. Mind you, drinking water deionized to such levels will actually accelerate teeth decay, and has been shown to give organ damage and other unpleasant side effects in mice who were given it for long term consumption. Though I suppose you could go through the hassle of deionizing the water, and then adding back just the ions you trust (Ca, Na, Mg, Cl, etc.). For a more pragmatic approach, you could just limit yourself to bottled water, beer and wine imported from Europe; >99% of all European drinking water is non-fluoridated.