If your water is coming out brown, like in the example, boiling is likely insufficient. (You really don't want to gamble with needing a doctor/ER at that time.) It also assumes you have a means to boil water. A filter might help in addition to boiling and/or drops, and a filter is one option the article suggests as options for water.

I think we'd do a disservice to people by discouraging them from having a modest backup plan for water during a possible pandemic quarantine. Remember the rough "3" rule: 3 minutes without air, 3 days without water, 3 weeks without food.