Nope, he's phrasing it to "medical doctors" as a hypothetical, a question posed, maybe using UV light.
The CDC Suggests the following:
"Add 8 drops or a little less than 1/8 of a teaspoon of 5%-9% unscented household bleach to 1 gallon water. For cloudy tap water, use 16 drops or ¼ teaspoon. If you don't have household bleach, chlorine dioxide tablets or iodine can be used according to label instructions."