Some ideas (some might have things you need to avoid that I don't realize - sorry):
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Cans of beans that can get eaten plain ( ie. I often have canned garbanzos in our kits)
Canned veggies (I'll often have corn or beets which I think are okay cold) - dunno if three bean salad works either, but thats good too
Jar of pickles & or olives (which are high fat/calorie)
Fruit juices (can also get used to soak or cook other foods in)
Dried fruits (can also get soaked in juice to be more filling or fresh-like)
Rice noodles (can get soaked in juice for flavor and eaten cold, or with canned veg)
Dehydrated 'just veggies' or similar
'instant' pre-cooked rice packets (not sure if they have preservatives you can't eat or not?)
Any cooked, canned soup that you can eat (lentil? black bean?)
Tins/bags of nuts
Roasted seaweed
Canned coconut milk (to drink or soak foods in to add calories)
Instant black bean dip or similar (if you can find it and it doesn't have bad ingredients)
Sprouting seeds and simple supplies for sprouting them
Dry polenta/cornmeal (for making porridge)
Jar of honey (or candies/gum that meet your requirements)
I suppose if tuna is reliably gluten-free, canned tuna might be a good addition too (for an emergency, after all) but that's up to you.
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I personally keep our 'family' kit in a 5 gallon bucket, and do get full size cans or jars of stuff (that I plan on us all sharing). Â But you may want to consider smaller size cans or more individual servings of things to be able to include more stuff or make it slightly more portable.
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