I think it is probably worth doing an extensive scenario plan. Obviously you'll need field kit for regular use, you may also want to pack a small amount of survival kit on person as a backup. Whether you want that to focus on tactical/e&e scenarios or on regular survival is up to you.
FWIW in an e&e scenario, a compass (run in the right direction), water carrier/purification (stay hydrated so you can keep running) and shelter (space blanket or similar in OD so you can rest and stay dry when you stop running) are the only things some colleagues of mine in the services feel they need. Most of the other stuff is seen as ballast if you are genuinely under pressure.