During an emergency, you never know about the availability of food in the nearby supermarket. Thus, you should have a backup of food in your pantry and a stock that can last around 4 to 5 days. You can have some high-calorie foods such as trail mix, dried foods and chocolate. Pop-top cans of tuna fish and meals-ready-to-eat are also pretty good options. These foods have an expiry date, so check before consuming and replace them from time to time.