Fluoride occurs naturally in tea, in much higher concentrations than in your drinking water, and people have been drinking tea for thousands of years. In small doses fluoride is a health benefit, and there is no serious research proving otherwise. Fluoride hysteria is just that... hysteria. It's a conspiracy theory.
The only real problem with toxic levels of fluoride comes from waste from aluminum smelting plants, and that water isn't meant for human consumption. It does affect fish though, if that makes you happy.
Now if you'll excuse me I have to shield my head with tin foil because the HAARP network is redirecting my brainwaves to a secret CIA bunker in the Horsehead Nebula.