As far as I know there is no fluoride in the municipal water. I use a Big Berkey water filter as I'm concerned about storage of water in plastic bottles that may be stored in the heat.
Masafi bottles are without fluoride , also Al Ain, there are new green bottles with fluoride but not the other blue ones. I just checked the cooler bottle it says 0.08 mg/ltr fluoride which is almost nothing ??
We use masafi for the cooler & Arwa for bottles , Masafi has no fluoride and Arwa has less than 0.1 , nestle pure life is the only water I'm aware of that have added fluoride to it.