In the short term and the long term... The most valuable ability in my opinion would be a high degree of lethality.
Regardless of the type of apocalypse to happen there will be a lot of desperate people with guns. Eventually survivors would band together in one form or another and take apart smaller groups of people. People with the most resources will have the most to lose.
Realistically though I would say wisest course of action would be having a plan for basic necessities like food and water along with knowledge of how the people around you would react. It is never good to not factor in the actions of people who being desperate could try an ruin any planning you may have undertaken in advance for such a situation.
__________________
0PtIcAl
|