Whether Ponce ever actually got to Bimini is still a point of contention amongst the historians. Most natural spring water, and even bottled water does contain fluoride. The amount can vary significantly depending on rock and soil conditions around the source. There's a gathering body of evidence that under certain conditions fluoride can actually reduce the effects of aging prolonging youth. Some studies have found that even small dosages can drop IQ by ten to fifteen points.
Most cities add tiny amounts of fluoride to their water.
Many prescription drugs especially psychoactive agents such as anti-depressants use fluoride. Other drugs use fluorine compounds to enhance effectiveness and reduce the quantites of other, more expensive active agents required. Check the pharmacological name and see if it has fluo-anything inside it. It is very possible that if you're taking one or more of these or many other types of drugs, you're getting a fairly significant dosage of various fluoride compounds. Just a few parts per million too many and really nasty things can start to happen.