Just found a $10 of a $50 purchase at Safeway in today's Daily News. A gallon of water is generally about a dollar, so for no extra money out of my pocket, there's 10 gallons of water for my disaster supply kit, in addition to the groceries that I already need (why do the children demand to eat every day?!). That alone is almost enough to satisfy the proverbial "one gallon, per person, per day for three days" rule of thumb for a family of four.
Don't need water? Please, you always need water. But if you really don't, how about a flashlight? Or some canned food? Batteries? Now, go forth and SAVE!