I hope this makes sense to you. It sounds like you have already figured out that with a growing teen and two additional children in the household, this will be a good start but that more will be needed over time. By doubling these quantities my guess is that you will be better prepared, food wise, than 90% of the population. And even without doubling the quantities, you will be better prepared.
This is a partial list of many things that disappear fast in an emergency.  Look for things you should stock pile before the crisis.    Many of these items can be used to barter for items that you or your family might want or need. For example: During the gold rush of 1849 the people who had shovels became wealthy from the miners who needed them.  Remember:  A wise man purchases his insurance before the fire starts.  Create a scheduled plan to get any of these things.
I.N.C.H. pack: I'm Never Coming Home pack. A pack containing everything needed to walk out into the woods and never return to society. It is a heavy pack loaded with the gear needed to accomplish any wilderness task, from building shelter to gaining food, designed to allow someone to survive indefinitely in the woods. This requires skills as well as proper selection of equipment, as one can only carry so much. For example, instead of carrying food, one carries seeds, steel traps, a longbow, reel spinners and other fishing gear.[citation needed]
In Eskridge, Kansas, a family lives in what was previously a shelter of a four-megaton hydrogen bomb. Because of this, their 47-ton garage door holds a tremendous defense that can withstand a doomsday blast. After investing some hard work, the site becomes a cozy underground home named Subterra Castle which will shield them from thermonuclear wars, harsh weather, earthquakes, and other crazy apocalyptic event.
“Everything started flying out,” she says. Buckets and cans rolled out of the pantry and down the side of the mountain. Hurricane Maria claimed almost all the food Jennifer had stockpiled, in addition to more than 30 chickens, two cows, four pigs, six ducks, and a turkey. “I had prepped for two and a half years, and I ended up with preps for six months,” she says.
Your next trip to the grocery can yield extra provision to add to your emergency supply. The next time you have a couple hours of spare time you can scout rural routes out of town, or get in some practice on any number of skills. Even so, it is easy to feel overwhelmed and bewildered staring down all the possible disasters that may occur and all the varied skills to learn and supplies to gather.
So, what about specialty prepper food? Is there such a thing? Yes. Even though you can turn your everyday food into prepper food simply by storing it away under the proper conditions, you can also purchase speciality prepper food that has a long shelf-life and will keep you and your family well-fed for a long time. There are basically two types of specialty prepper food – MREs and freeze dried food.

Yup, rocket stove DIYs are easy to find, but to each his own and if I can afford to spend $150 on a good knife, I can also afford to spend the same on a rocket stove that’s good looking, lightweight, extremely portable and a one-time buy. It’s the kind of thing I wouldn’t mind pulling out in front of the sheeple to have a BBQ or go camping with, and that makes me happy one way or another. Just like the rain barrel, I could DIY one myself, but it’s unlikely to look even a fraction as good (especially with my incredibly poor DIY skills), and so I’d rather just buy one and be done with it.
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It isn't hysteria, and GMO isn't 'evolution'. One of the biggest issues for preppers and survival is that GMO seeds will not reproduce in the same way if the seeds are saved and re-used. In fact, in many instances (maybe all?), it's illegal to save the seeds and re-use them! It's far better to track down heirloom seeds that are native to your area and/or compatible with your climate. A good place to start looking is
Gluten free flours are another tricky cooking skill to master. One of our close friends and neighbors eats a gluten free diet so I have learned to cook some things without wheat but when it comes to baking I usually just buy the gluten free baking mixes that you can use just like regular flour. For SHTF, you may want to mix up your own mix and vacuum seal it for easy use.
I found the buckets at Wal Mart on an end cap. They are near the hardware and paint sections. You may also check the online Wal Mart. I am not sure if they have them there, but I was told that they will order things and have it sent to the store for pick up. Worth checking out. I have been buying a couple of buckets every few weeks… and my store of buckets is increasing.

For global catastrophic risks the costs of food storage become impractical for most of the population [54] and for some such catastrophes conventional agriculture would not function due to the loss of a large fraction of sunlight (e.g. during nuclear winter or a supervolcano). In such situations, alternative food is necessary, which is converting natural gas and wood fiber to human edible food.[55]
Do you have a way to measure the prepping milestones you’ve hit?  Are you looking for a list of survival gear that can help you determine the right preparedness supplies for you and your family?  Have you ever felt anxious or overwhelmed on your prepper journey?  You are not alone. I’ve noticed that on several Prepper discussion boards people are looking for an extensive Prepper Supplies Checklist, a way to organize their preps, wishlist, and survival goals.  If you are one of the many looking for a way to organize your preps then I hope this article and checklists will help get you organized and stimulate new ideas.  If you haven’t thought about getting organized here are some reason to consider it:
After 15 minutes, I was startled to discover that the cereal had puffed up into a Kashi-like multitude of grains, flecked with tiny pieces of apple, complete with green peel, that looked just-chopped. It didn’t taste as good as it appeared: Eyeballing a fourth of the bag had resulted in a poor distribution of seasoning, yielding a flavor I can only describe as water laced with traces of cinnamon and sugar, though subsequent attempts tasted better.