Op, some good rec's above. I fly with a guy who did SL and various African contracts in his past, and going on discussions we've had, couple of points for your bug out kit.
1) Small set of binoculars. A set of cheap £10 8x21 will serve you well and are invaluable for getting a run down on whats around you. Take up no space at all.
2) Silicone water bladder, and fill it every chance you get. You can bet people will get dehydrated in a stress situation, as the adrenaline hides the thirst very well up until it starts to become a visible issue. Use the buddy buddy system to make sure people get it down there necks as much as they can.
3) A high flow water filter. He used to use the First Need XL, as it takes out everything (is it still the only one certified by the Americans for disaster crews?) thats nasty, is easy to use and flows well. Your popularity goes through the roof when your the water guy.
4) Batteries. You will be amazed how quick modern kit like GPS and lights burn through them.
5) A bombproof backpack. Dont cheap out like he did - his first lasted a month before it died! Go for Maxpedition or 5.11 etc. The operator boys use them for a reason.
6) Lifeboat rations, blue pack ones. Taste like crap but awesome calorie content.
7) Lock Picks. Good for getting into stores via padlocks etc, and be practiced and know how to use them. I'm quite keen on playing with mine, and can open most stuff. You'd be amazed how addictive picking is. Mine are of Southord manufacture.
He also carried 5 gram bars of gold as bargaining chips, sewn into variious places on clothes/backpack etc, but that might be a bit extreme for some. He does reckon he needed that once though to get a fuel bowser to come out and fuel the aircraft at a time when bad guys were coming over the hill.
Good luck, hope it all works out.