looks like the sort of thing that would give the average person a false sense of security.
back to the question of what to add is more of what to toss out.having said that i would want a pack of those lifeboat rations,a big water bladder and a filter or tabs,a nylon rain jacket and poly fluff jacket as blankets don't cover everything and would slip off when moving.a few TP packs that come in MRE's and wet wipe sort of things.a LED light is a must and rather than a back pack i would want a pack frame because you can carry a lot more weight.i found that out when i used a yard sale frame to carry spring water back to my car.it was a easy walk but when i lifted the four gallon picnic jug out it was heavy!