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In a real pinch, you can use the water stored in the reservoir of your toilet tank—not the bowl—which brings to mind the very best water purifier.

Water Purifiers

Water purifier capabilities vary greatly. Be certain you purchase a water purifier capable of filtering out the following: pathogenic bacteria, parasites, herbicides, pesticides, organic solvents, VOCs, and heavy metals such as cadmium, chromium, copper, lead, mercury, aluminum as well as nitrates. They should also be capable of clearing out cloudiness, silt, sediment, foul tastes and odors.

The best water purifiers will do all this without removing the beneficial minerals your body needs. Clearly, this is a tall order and why this is an instance where you cannot afford to scrimp, as survival without a reliable source of water is an impossibility. I personally recommend either the Berkey or Katadyn. The manufacturer will tell you how many gallons can be processed though the water purifier before the filter(s) must be changed. You can calculate what your water purifier filter needs will be by adding the number of people in your family or group into monthly gallon requirements, then multiply that by the number of months you are planning for preparedness. Next, pencil in Murphy’s Law, and throw in a few more filter replacements!