I can remember back long before Trump that some bleach was recommended for water storage for natural and unnatural disasters. Just because you have never heard of it is not suprising.
I was simply passing on information regarding that I have known about for a long time. I can remember people storing water for Y2K and the CDC guidlines https://www.cdc.gov/healthywater/emergency/making-water-safe.html that adding bleach to long term stored water was recommended.
btw for those slow in the class and wanting to know my point - here are two government website that long before Trump indicated adding bleach to water was recommended - which guess what that is called - ingesting bleach ( just diluted ).
Twice in my life due to breakdowns of the city water systems it has been recommended to boil and in one case to also boil and add some bleach due to concerns.