
First know what you’ve got.
Do you have a food allergy, a food sensitivity, or neither?
A food allergy is a violent rejection by your immune system of even trace quantities of the allergen. “Immediate type” hypersensitivities such as peanut and shellfish allergies can be violent enough to kill the person within minutes after just a trace of the food. It’s this type of allergy that people carry EpiPens for. If you have this kind of allergy, you know it … and please have an EpiPen or equivalent about. Diphenhydramine (Benadryl and related compounds) are a very poor substitute.
“Delayed type” hypersensitivities are food allergies that work much slower. They won’t kill you, but they make you pretty miserable starting hours after you eat the food and maybe lasting for days.
Food sensitivities aren’t real allergies, but they do cause distress if you eat the food. Unlike allergies, people with food sensitivities can often get away with eating a little of the target food. If they eat too much, they get more or less vague and diffuse symptoms, many minutes to a few hours later. Abdominal distress, gas, and diarrhea are the most common reports.
Know where you are
If you’re going to go to a lot of trouble to avoid a food, it makes sense to know where you are first. That’s not as obvious as it might seem. For example, one or two percent of Americans are actually allergic (delayed type) to gluten, a protein found in wheat, other grains, and many, many processed foods. Another fifteen percent of the population or so are demonstrably sensitive to gluten, but not allergic.
On the other hand, more than half of Americans report they’re trying to eliminate gluten from their diets. It’s the ‘nutrition villain of the moment’; those of us who’ve been in the medical field a while have seen other such villains rise and fall in ‘popularity’.
There are lots of reasons why a high flour, high processed food diet can make a person feel lousy that are not about gluten. You probably don’t want to go to the effort of avoiding the gluten if it’s not your real problem. A gastroenterologist or allergist can help you get the testing done to nail the issue down.
So what’s to be done? If food’s hard to get you might have to rely on ‘prepper foods’; and if you eat something unsuitable and end up with it, ah, not staying with you as long as desired (no matter which end it exits) might weaken you more than not eating in the first place. It’s bound at least to make a bad situation more miserable yet. The best thing is to have prepper food of your own that suits your needs.
Those fancy, silly, upscale ‘natural foods’ are now your friend
I admit it, I’ve made fun of the trendy city folk and their trendy ‘all natural’ ‘allergen free’ etc. foods. They do tend to be more pricey than it seems they should be too, but there are exceptions. They’re of interest here because they have a short ingredient list that’s quite clear and usually avoids the most common allergens. In other words, they’re safe for someone allergic or sensitive. Some of them (made for the ‘outdoorsy trendsetters’) are also light, calorie dense, easy to cook or cooking-free, and shelf stable: Good emergency bag food. Energy snacks such as Larabars or Naked Bear granolas are two I happen to have tried that are good cook-free calories.

Short, straightforward ingredient lists coupled with fairly long shelf life and high calorie density and temperature stability make these good energy bars for the allergic person’s emergency bag.
Backpacker’s Pantry makes meals that only require adding boiling water to the envelope and waiting 20 minutes to have a hot, robust meal that’s actually nutritious, filling, and easily chosen to be allergen-free. They’re also a far cry in taste different than the usual ‘pasta with sauce’ ‘chili’ or ‘cream soup’ entrees that are so popular in many ‘prepper food’ offerings, so that’s a plus. (There will be a review of some of these showing up on this site soon.)

Substantial meals that make it easy to avoid allergens, light weight and stable enough to keep in a go bag, requiring only boiling water to cook and under $6 a bag.
For longer term, you’re going to have to learn to cook.
Five gallon buckets of oats, potatoes, rice, corn, etc. with 30 year shelf lives are among the choices from ‘prepper’ suppliers. Get a grinder to make flour out of them and you can learn to make a lot of acceptable substitutes for family favorites out of these materials. It’s not quite as easy and familiar as wheat, but it’s not that much of a reach.

It may take some new cooking skills to convert things no one in your family is allergic to to welcome staples, but it’s definitely do-able.
It’s all manageable … if you’ve thought and prepared ahead. Sure it’d be nicer to have one of those cast iron constitutions, but all we can do is play the hand we’re dealt. Happy eating!
We are a household with multiple anaphylaxis… to a weird grab bag of stuff…. egg, banana, coconut, honey (yes… Honey! And we can presume bee stings are a 90% chance – waiting for the second one to confirm), sesame, tree nuts….
I’m currently investigating sublingual adrenaline in powder form… the powder form has a longer shelf life, and there’s a start up inventing a powder epi pen replacement (it will mix powder and liquid at time of use, extending shelf life and reducing temperature impacts)…. Sublingual adrenaline is being Researched currently and showing promise… as a SHTF back up it’s the best idea I’ve found. What are others with anaphylaxis doing? (Aside from avoiding things… we’re facing a high risk of bee, and ant sting allergies here though, so there’s only so much avoiding we can do!)
I’m glad you’re thinking about the shelf life of the Epi. I use it at work, and they aren’t kidding about how fast it loses efficacy. I sometimes have to remake solutions mid-day, the unstabilized reconstituted powder degrades so fast. Better if you protect it from light (also true of the powder). Aluminum foil is a good/cheap method for that.
Have you looked into epinephrine inhalers? The shelf life isn’t forever, but they’re now available over the counter and cheap enough to replace a now and then, given the seriousness of the allergies. There’s a little more information here: https://beansbulletsbandagesandyou.com/bullets/2019/05/28/preppermed-101-epinephrine-inhalers-asthma/
After seeing your post on the inhalers I was very curious. Sadly they are not available in Australia, but I could do a ‘personal use’ import and get a three month supply over… what is a three month supply of an emergency med … hrm..? I wonder…
I’m also curious what the dose of an inhaler would be vs an epi pen. Also how the administration in closing air ways would assist via inhaler vs blood stream adrenaline…
Worth having a few around, I’ll see what I can do. I”m also contemplating the shelf life of powder form, and dosages…
The anaphylaxis has two really dangerous components: the airway closing and blood pressure drop. Epi helps with both. Inhalers give higher doses to lung tissue than blood, but they *do* have some blood-borne effects. I don’t know about dose either. My plan would always be to go with the Right answer if possible (EpiPen), but if it were me feeling anaphylaxis coming on I’d give the inhaler a shot (or three) if it’s all I had.