At the story, "... At home, the 29-year-old has rations for two or three months, about 84 liters of water, blankets, candles, live chickens, spare oil for his car, a first-aid kit and a BOB (or portable survival kit) packed with a flashlight and freeze-dried food...."
84 liters is around 22 gallons. Less than one month of water. I guess then it does not matter that he has so little food...