not to give us a bad name, but did you think about some whiskey or brandy. not a lot, not talking about getting snookered, just a dollup in the coffee or Tang to make the bed a little softer? I always take some with. maybe 4 to 6 oz in a flask.
Also, video cam is good idea, but does yours take stills too? mine does, means you only need one, or you take still and he takes video....
first aid meds. I would ask your DR for an order of Tylenol 3, an order of vicodin, and a Z pac of azithromyicin. You get cut or sick and having some antibiotics and some pain pills will be wonderful. My brother stepped in a hole while canoeing in the BWCA and having a few days of pain pills made it possible for us to manage him despite a broken foot. the pain pills are there also for safety. you get hurt bad, pain pills can help offset shock and get you to where you can function.
hockey tape, you know the white stuff for taping ankles...allsorts of uses and cheap and light. also some mole skin or molefoam. both will make it possible to have fun despite a skin problem.
Tagaderm sheets. clear plastic wound protectors. i have some that are 9x9 or so. just two would allow me to dress most any wound. weigh nothing and can save your life.
food suggestions
powerade or gatorade powder. great stuff. makes purified water taste ok. also keeps you going better.
i would add few of those little dry soup-in-a-pouch sort of things, when you cook your rice, add a little more water and a packet of soup and you think you are eating a meal.
clothing.
I now go camping and canoeing and bring hardly anything non synthetic with anymore. no cotton, (just a bandana) no cotton, it gets wet smelly cold and after a few days in the bottom of a pack often moldy. the new fleeces and microfibers keep you warmer, dry faster, weigh less, do not rot, and feel better on you after a couple of days. Plus if you get them wet they will still keep you warm.
if you find water you can wash fleece by hand, swing it around your head and in a minute it is dry. get cotton wet on camping trip and you are wet for the rest of the week it seems. I personally also would pack some sort of flip flops or ultra light shoes. you get your boots wet you are going to want something else to wear around camp till you get them dry.