A study was done a few years back. Average amount of food in an urban apartment, 3 days. Average amount of food in a suburban or small town home, 2 weeks. Average in a rural home several months. Urbanites usually have small apartments with no freezers and limited cabinet or pantry space. So they go to the corner market for supplies every 3-4 days. Average suburban or small town usually buys enough from paycheck to paycheck, thus the two weeks. Most rural folks can, preserve, have gardens, etc, so they put up what they raise or grow by canning and freezing.
I recommend if you can't store water, you can buy a water filter system or portable water filter if you have access to a creek or stream, you can make your own potable water. Water takes a lot of space to store. In Florida, they have hurricane bags. You put them in your bathtub, and fill them up. Holds 80-100 gallons. They cost about $25, and you can fill them before a hurricane hits, and have potable water for several weeks if the water supply gets cut off. If you have two tubs, twice as much. I have three tubs plus a seperate shower. So I can store up to 300 gallons of potable water.
Canned goods can last two years. Dry goods longer. Frozen, you must have a generator to run about 2-3 hours a day to keep stuff frozen.
Another study was done by the military. They said if an EMP bomb or giant solar flare knocks power out nationwide, within 6 weeks, as many as 100 million people could be dead, starting in the inner cities. Elderly, disabled, poor, will die from lack of food, power for life support equipment, lack of fresh water, lack of food, and unsanitary conditions. Colera, colds, flu, and pnumonia will also take their toll. Lack of antibiotics will also kill people. People will fight over fresh water and food. Rural areas will fare far better. Food and fresh water will be more available. Outhouses can be built for sanitation if running water isn't available. Most in rural areas are also armed to fight off urban bands who make it out of the cities trying to find food.
Let's see how the northeasterners cope with the cold, lack of power, lack of fresh water, lack of food for the next few weeks. Another northeaster is coming in this week bringing cold wind and rain. I thank God I don't live up there.