So this is a test of 8 water filters as well as one type of water purification tablets (they might actually be strips, but same difference). All but the Grayl filter and the water purification strips are only good for bacteria and protozoa, while the Grayl and the purification strips will also filter out or kill viruses. If you are only camping or hiking in the U.S. or Canada, you probably don't need to worry about viruses, but you do need it for foreign countries. After a SHTF event? Who knows.
For preppers, though, you might want to look at the Sawyer Squeeze. According to the video, the manufacturer is claiming it can filter 378,000 liters/100,000 gallons of water as long as you take care of it--clean it, back flush it, don't let it freeze. If this is correct, then the host is not wrong in saying that it could potentially last you a lifetime. One of these per person in your household (or one plus a backup) would probably give you all the drinking water you would need for grid down situations.
VIDEO: "I Tried 8 Hiking Water Filters From REI.. Here's My Honest Review and Comparison"
Taylor the Nahamsha Hiker (28 min.)
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