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The good news: chlorine is really, really easy to produce. One device (there are more) that accomplishes this is the WATAsol, developed by the Swiss organization [http://www.antenna.ch/en/antenna-technologies.html Antenna Technologies]. A container with two electrodes is filled with brine, an electrical current is run through the brine for a certain amount of time, and voilà. (For the technically inclined, the current turns sodium chloride into sodium hypocloride). One litre of the resulting solution is enough to disinfect 4,000 litres of drinking water. The solution is bottled and sold by local entrepreneurs, usually women.