It took me forever to purchase enough water in order to feel secure for a reasonable short-term disaster. It's not as fun as buying a a folding knife. Water is boring right? Wrong! If you go without water for even one day, I guarantee you will be trading in all those gadgets and probably alot of money for a drink. I have stored about 68 liters for drinking/cooking. Budgeting 4 liters per day, it comprises 17 days supply. Nearby, I also have the Pacific ocean for bathing, and also a man-made lake for filtering/disinfecting during an extended crisis. These beauties are going back in the closet with a calendar reminder to start rotating/refilling in about 3 months time. Stay fresh, stay hydrated.