If I happen to be up here at school when the SHTF, I'd like to be prepared. If possible, I'd like everything to fit into a large-ish backpack, as I have a pretty sturdy one already. First priority: Good folding-blade knife, suitable for any use including defense. As I live in the residence halls, any kind of firearm is right out. Although knives are counted as weapons, the de facto consensus is that fixed blades are barred but folding tend to be okay. Any recommendations? Second: Water. I have a couple of large Lexan bottles, but I drink a lot of water, so I'd like to have a means of getting more. Iodine tablets/compact filter of some kind? Third: Food. I'm thinking three to five days' worth. I have a Costco pack of Clif bars up here to snack on, but I'm sure you diehards know of a better option for serious scenarios. Fourth: First aid kit. Got a pretty decent one, but I don't know if it's as complete as it could be. It has: - Bandages - Alchol swabs - Gauze pads - Medical tape - ACE wraps - Antibiotic ointment - Pain reliever Other stuff: - Strike-anywhere matches - Compass - Down sleeping bag w/ compression sack - Socks and underwear - Duct tape - Flashlight - Paracord - Chapstick - Gloves - Season-appropriate outerwear I'm sure I'm forgetting a lot, help is appreciated. I participated in BSA during grade school, so I know how to use my compass, make a fire, and basic survival. I already wear a pair of good hiking boots every day.