Sticking with the OP question, according to
this site:
Fluoride is more difficult to remove than most water contaminants. For practical purposes, there are three choices for removing fluoride from drinking water: distillation, reverse osmosis, and filtration through a special fluoride/arsenic reduction medium called activated alumina. Bone char carbon is used in some localities.
If it is important for you to filer out fluoride on the go, it sounds to me like an HTI filter such as the
Lifepack is the closest you'll get. It is a
forward osmosis system, which is said to provide filtration comparable to reverse osmosis.
One of the downsides is that you don't end up with water but rather a sports drink solution. If you really want to be in control of the ingredients used you can apparently make your own salt/sugar solution, as stated
here:
HTI’s sports drink powders and syrups have been formulated to maximize filtration capabilities, enhance oral hydration and drink preservation. However, other kinds of combinations containing sugars/salts will function as an osmotic agent (Ex: Gatorade, Powerade, maple syrup, etc.)
A fun little fact about this system is that it will filter out close to 90% of urine salts, and has been credited with saving lives in this manner. The story is mentioned in
this article.
No affiliation with HTI or any of the linked websites. I've not even tried said product and this information is gleaned from the Internet only, so take it with a few grains of salt.
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