The British Army, and other ...

The British Army, and other expeditionary folk used to have available a ceramic filter device that was about the size of a coffee maker.  Unfortunately, I cannot remember the name of it, but apparently that was effective, but they also carried quinine for combating malaria.

I did find it! http://www.survivalunlimited.com/waterfilters/berkfldhistory.htm The British Berkfeld ceramic filter was and is the equal to the one developed by Louis Pasteur.  Actually, the filter was more used right in London, because the water from the Thames was dangerous, and polluted with cholera, etc.  Doulton, the inventor/developer was knighted for this filter, and it became the "Royal Doulton" filter company.

You simply cannot offer a delicate high tech solution in an undeveloped, noncommercial community, or it loses deployment quickly, with no replacements.  I suspect ceramic filters would be far more appropriate to deploy in most places in the world, and perhaps the locals could be trained sufficiently in ceramics production to have at least one factory in their country.