Regional emergency planners unveiled an ad campaign Tuesday aimed at encouraging residents to collect what they call the three most important survival supplies ? water, a radio and a flashlight ? which could get them through the first three days of a disaster.

More than 2.5 million residents of Baltimore City and Annapolis, as well as Anne Arundel, Baltimore, Carroll, Harford and Howard counties will see the “Ready? Set? Good” message in TV, radio and print ads running until the end of the year, officials said at a kick-off event. The ads are simple, using short sentences like “Emergencies tend to turn supplies into a demand,” and graphics of the items.

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