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It's already in the water... I try to drink water without fluoride, but that doesn't do anything for the water I wash my dishes with or shower in. You can get filters installed to remove most of the fluoride, but it costs $$$$.

Even the water you buy in the bottle, claiming from spring water still contain them.
??? WTF

I get spring water... Most bottled water is filtered tap water which odds are contain fluoride. It takes expensive filters to get it out it is so small.

Can you trust water stored in plastic jugs labeled "spring water" that may or may not have been sitting in storage which then gets transported sometimes thousands of miles to store shelf for an indeterminate amount of time all the while the plastic container is leaching dangerous chemicals know to have ill effects on the human endocrine system ? Although it might be more time consuming and take extra effort it seems best to actually find and collect water from a non contaminated natural spring and store it in non reactive containers such as glass bottles in a cool dark location out of direct sunlight.

There are also issues with the plastic leeching PCB's or whatever into the water, especially if it has been sitting in the sun.

Yeah, bottled water is a joke. I only store it for emergencies. Otherwise your best bet is to use a real filtration system, not the joke Brita crap.

Check out https://www.berkeywater.com/

Cheers!

Core bottled water doesn't have fluoride. But, not sure if it is available where you are.