It's not really meant to be advice. It's the author's own experience, ironically written as if it were advice.
For example:
"You did bleach ten gallons of well water for long-term storage already earlier in the year, right? Good."
This is sarcasm, because the author did not do that.
Perhaps it's an AI generated article. A real human would have realized quite quickly that you can put snow into the tank of a toilet when the power is out.
Ah I see. That didn’t translate well for me. Maybe because the title primed me into thinking that this was meant to be helpful.