r/trailmeals

This summer I am planning a 4 day camping trip in Michigan with some friends, and we plan to do some day hikes and pack lunches and snacks to eat on the trail. However, the five individuals I’m traveling with all have different dietary restrictions which include

Peanut allergy
Tree nut allergy
Legume/bean allergy
Gluten allergy
Dairy sensitive (can’t have dairy milk, some types of cheese)
Sensitive to fruits with skin (apples, grapes, etc)
Type 1 diabetes

I’m trying to think of some meals that might satisfy most (if not all) of these since I don’t want to pack different ingredients and prepare different meals every time we eat. Good news is that since we’re returning to our campsite each night, we can get things from our cooler/car to bring with us. We also have a backpacking stove that could be used as well. I figure worst case scenario, everyone can pick out their own freeze dried meals to take, but I wanted to see if anyone had any creative ideas.

I have 2 half-used Snow Peak Giga Power canisters that have been sitting for quite a long several years. They might even be older than 6 years not sure. One has original cap on it and the other does not.

I'm going out in a couple days and decided to test the one with the missing cap. Upon unscrewing from my stove, the canister valve stayed open, causing a high & fast leak. I let it leak out in the backyard.

1. If that happened to me out in the field, what is the proper procedure to save the fuel when discovering the can's valve now faulty, wont close? Should I be screwing it back onto the stove and hope for the best? Assuming that the stove's valve will save a faulty canister valve?
2. Should I also test the other old can (had cap on it) or just replace both of them with new ones. I think after 6 years maybe fuel has degraded?
3. What brand or type of fuel is best for the Firemaple Stove? (Jetboil's budget competitor) It's strictly for boiling water nothing else. Spring-summer time, desert heat at night, is there certain type of fuel better suited for that?
4. How or where to dispose of old canisters both full and used?