Chlorine dioxide Solution. It has even a better efficacy and safety record than HCQ, which has long been recognized as one of the safest medicines for over 75 years. HCQ is very inexpensive and CDS is even less expensive than HCQ. See and .
It comes out of your tap for practically free.
Some municipalities, not many though, actually use CDS for water treatment. It is an excellent disinfectant. However, it is far different than the claims of it being chlorine. When I go backpacking, I can add a few drops to pond water and it kills any microbes that may be there. I've used Lugal's iodine for this purpose as well. However, CDS is by far the most effective and safe treatment.
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