Keep it cheap and light, ramen, repackage in ziplock and throw away the msg packet, with foil pack tuna or chicken. Pour water into ziplock with ramen wait 10 min, add tuna/ckicken or other,
Maybe bring some extra spices, there light and inexpensive you can ziploc them as well or get small reusable containers.

This is basic but maybe a good intro.
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"In the beginers mind there are many possibilities, but in the expert's there are few."
Shunryu Suzuki