2 drops of bleach per liter, let stand for 30 minutes, if cloudy, repeat. The 2 hours boiling in the report to clean water is nonsense and sensationalistic. It's not true just because it's on the net. To kill literally everything, boil water (a rolling boil) for 1 minute at sea level adding 1 minute for every 1000 meters of elevation. The USA "Centers for Disease Control and Prevention" guidelines will confirm this or very similar.
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