In an emergency situation, the average person needs about two thousand calories a day to survive. Your disaster menu should include meals that provide for sufficient calories per meal and per day. Budget around 2000 calories/day for women and around 2400 calories/day for men. If strenuous activity is anticipated, the number of calories should be increased by about 200 calories.
However, this number can vary depending on a person's age, activity level, and other factors. For example, someone who is younger and more active will need more calories than someone who is older and sedentary. Additionally, someone who is pregnant or breastfeeding will need more calories than someone who is not. In general, it is best to err on the side of caution and assume that you will need more food than you think you will. That way, you can be sure to have enough to survive in an emergency situation.