When cooking meat you dont need to stick it over the fire on a stick. It goes in the hot coals and always has white ash or charcoal attached; the charcoal is pulled off before eating.
Black char coal absorbs poison in the case of food poisoning.
Tumbs active component is calcium which nutralizes acid. Ash has an abundance of calcium
The answer is to not think too hard. First think about all of the things you would take anyway and then supplement for emergencies; the unexpected.
Goal is to get home and rescue, by self or otherwise, is the mechanism by which that goal is achieved. You will need your position and you will need to communicate it.
Phone, charger pack, ...