There's a lot to be done in the world of water management. Millions of lives could be saved by people boiling their water before drinking. Boiling also gets rid of excess chlorine.
Millions of lives could be saved by better food prep and hygiene. Washing hands before cooking, making sure food such as cooked rice doesn't stay at room temperature for too long.
Boiling does not clean the water from some algaes eg Great Lakes, In some cases boiling algae water can make the water more toxic.
Some methods to clean and desalinate water at point of use.
http://en.m.wikipedia.org/wiki/Solar_still
http://en.m.wikipedia.org/wiki/Reverse_osmosis
Solar kettles, fragile but they do work on sunny days
http://www.amazon.co.uk/Contemporary-Energy-Ltd-T-43-Kettle/dp/B009YFSKKY
Home distillation units
http://www.moneycrashers.com/make-distilled-water-drinking-home/
Home filtration units, (A lot of bother maintaining replacing filters) pro pure seems pretty good. Anything has to be better than trusting the crap coming out the tap.
Water purification tablets and powders.
(Can't help thinking that relying on powder for clean water something has gone terribly wrong.)
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