This is the best tl;dr I could make, original reduced by 89%. (I'm a bot)

Pure water can be obtained by using a reverse osmosis filter, the gold standard of home water treatment, but for Mr. Singh, the goal is not pristine water, per se.

"Without water treatment, there's acute and then chronic risks," Dr. Hensrud said, including E. coli bacteria, viruses, parasites and carcinogenic compounds that can be present in untreated water.

Dr. Hensrud said he has noticed more interest in alternative water sources; a patient recently asked questions about a raw water he had been drinking.

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