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Chlorine dioxide tablets. The stuff for cleaner and scent removal is fine as long as it's pure unadulterated chem.
Bonus is it helps cure cancer, destroy microtech, cuts down candida and other internal and external fungi, cleans mold from colon, and is antiparasitic.
People try to say "Its bleach it's toxic" but ive been drinking more then is recommended for years now.
Be prepared to feel superhuman, after feeling a bit shit for a week.
Sorry for the rant, it's used in military water kits and such so it works. Do your own research as always and enjoy broski