1200 Calorie Food Bars food ration that tastes great, and is also very nutritious. Has a five year shelf life. This 1200 calorie food ration is great for the one-day meal. All our food rations are baked under strict supervision and all have that great taste of apple cinnamon. Mayday food rations can be stored outside up to 149 degrees (°F) and can be eaten without preparation.