I say don't bother with filters/RO. Go distillation. Basically 99%+ of ALL impurities are removed (without the "flat/nothing" taste and use of plastic that comes with RO). Flouride is just one impurity that you know about.

"Distillers" can be expensive but there are alternatives.

A secret: go on aliexpress and look for items like this. These are intended for making your own spirits but they don't have to be used that way.

You just put it on your stove top and connect it to the faucet (find one with the silicon tubes included). 10L takes ~2:40 to finish. I store my water in an enamel pot so there is no change in flavour.

I say don't bother with filters/RO. Go distillation. Basically 99%+ of ALL impurities are removed. Flouride is just one you know about.

"Distillers" can be expensive but there are alternatives.

A secret: go on aliexpress and look for items like this. These are intended for making your own spirits but they don't have to be used that way.

You just put it on your stove top and connect it to the faucet (find one with the silicon tubes included). 10L takes ~2:40 to finish. I store my water in an enamel pot so there is no change in flavour.