Put 3 tuna cans on the bottom of a large pot and place a smaller pot on top of the tuna cans. Turn the lid upside down and place it on the large pot. Bring the pot to a boil. The vapor will condense on the under side of the upside-down lid and flow down the lid to drip into the smaller pot. To hasten the process, you can put a bit of cool water in the lid, but make sure the cool water can't drip through the lid into the water below.
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The information is compiled from sources deemed credible, but readers use it at their own risk. The time to build the cellar is before the tornado hits.