Hasbinbad actually understood this and got the take-home message from it, but water purification doesn't require any iodine or attenuation. What he outlined was a subjective way of saying "no more than 3 parts per million of chlorine" after 30 minutes. Chlorine is all you need for microbes, citric acid is all you need for pH. RO will handle everything else. You can make a crank generator from a sufficiently cheap reversible drill if gas power isn't available.
The water might be some funky color, but it will be safe to drink.
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