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1ppm is the standard, so your water treatment plant is doing stuff right at least?
There is no way to say. Different bacteria react differently.
If you were to take an already brewed tea (with active and large bacterial colonies) and pour it into a nutrient-laden medium containing 1ppm fluoride. You would probably not hurt the overall colony much.
The problem I see here is that you're starting from relatively low numbers of bacteria. The strength of bacteria comes in numbers--and so this might cause a problem.
Here is my suggestion for you before going out to buy an RO.
I don't currently have the time to explain my reasoning--but it comes from my biochemistry expertise so let's just see if I'm right:
Try to add some heat to your brew. Maybe one of those root warmer pads would do the trick?
The short version of why is that this might increase enzymic activity which could help to attenuate the damage which fluoride does (part of which is enzymic inhibition, especially of phosphatases--the other part of which is nucleophilic hydrogen substitution which can make it impossible for the organism to remove waste and toxins).
You do need to watch the temp. You can only go so high before you start to kill stuff. Bacteria are much less resilient than people think. If I put 1 million bacteria in a test tube of water and shake it vigorously for a minute, I will probably kill half of them.
Im sorry to give this to you in Celsius, but its what I'm used to from lab work. Anywhere from 26-37C is about where you want to be (37 is on the extreme upper end). I recommend 30c which is about ~85 F.
Once your brew is bubbling you can bring the temps down. I believe the problem you are having here is getting the colonies established. Once they are growing they will tend to adjust the medium to their liking--probably one of the coolest things about bacteria.