Comment by gorkonsine

What chemicals could you possibly need in your water? There aren't any; the only thing you'd reasonably want in there are some minerals to make it taste good (totally pure water tastes pretty nasty actually). If you're talking about fluoride, the answer is simple: brush your teeth regularly and use dental rinse. You don't need it in your water. The only reason they ever did that was because too many people had terrible oral hygiene habits decades ago; people are a lot better about this these days, with quality toothpastes, motorized toothbrushes, flossing every day, fluoride rinses, etc.