I think most of the time it's better to build your own kit together yourself, picking the best items to suit your particular needs and skills. It's true for survival kits, for first aid kits, etc. For emergency food storage they recommend "eat what you store and store what you eat" and rotate the food. Kind of like planning to eat a little of some "emergency food" every week. In a pinch you can always prepare barbecue seagull thighs, they are easy enough to catch.