One place many people forget about is their water heater. It has a supply of drinkable water in an emergency. One thing, though, when you open the drain tap in the bottom, the first 5 - 10 seconds of flow will look like crap because of the sediment and gunk from the sacrificial anode. I drain mind once a month and it's nasty. I don't want to think about what it would look like if I never drained it.
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Brian Brandt