There was a small earthquake in hawaii near a volcano just a few min before he posted boom. Earthquake had a depth of -.4km(depths are not usually measured in negatives implying an above sea level quake)
Well Water, rain capture, distillation, reverse osmosis are your only realistic options. #2 and #3 are imperfect, but significantly reduce the amount of F in your water. If you decide to distill use copper as it will also remove sulfide compounds that might be present.