Also sticking with the OP's original question:

1) Use an unfluoridated source - rainfall, stream, spring, or other "natural" source - just be sure your source is pathogen free.

2) With a problem of this magnitude, surely there must be a commercial source offering "poison free" water. If not, someone is missing a bet....

3) Move to Haiti. I don't know, but I'll bet their water is not fluoridated. If that is not the case, there are probably other countries that would fit the bill