In a serious emergency, water from the municipal supply may not be safe to drink. The Katadyn Combi ($160) is a portable water-purification system that filters out bacteria, protozoa, sediments and other contaminants. Its two-stage carbon-and-ceramic filter produces about 1 liter of drinkable water per minute. Katadyn’s optional faucet-mount adaptor ($40) makes the Combi convenient for home use, too.
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