Xena, >> fluoride <<
Yes, bottled water is the way to go, but it should come in glass bottles to avoid the BPA and phthalates (endocrine mimicking chemicals) found in plastic bottles. Glass bottled water is expensive, but an alternative is to get a reverse osmosis filtering system, though you'll need to add back the healthy natural minerals since these will be removed by the rev osmosis process. Rev osmosis is basically like distilled water, but you definitely need to replace the missing minerals.
Fwiw, for drinking water I use spring water that comes in 5 gal glass bottles, but if you are going to be heating that water (for soup, pressure cooking, etc), then use either distilled or rev osmosis water, since spring water has way too much calcium and the heat will create lots of insoluble calcium carbonate, which can adversely affect cardio function.
In addition to fluoride, the other halogens (chloride, bromide) interfere with thyroid function, by preferentially binding and blocking the iodine receptor, so you end up with low thyroid. You actually absorb more of these halogens (chlorine) from taking a hot shower, so a halogen filter on your shower head is also a great idea. There are also several brands of toothpaste that don't contain fluoride.
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