5) a multifuel backpacking stove with a a couple of spare canisters gives one a far wider range of fuels. siphoning from gas tanks for example. propane canisters, which are throw away, will probaly be the first fuel that becomes scarce.

6) an led lantern and flashlight with hi-med-lo output setting and using rechargable aa batteries are also a good way to go. some lanters come with a solar panel built into the top to charge it during the day.

9) a folding solar cell battery charger and and a relatively small assortment of lithium ion and nimh batteries will supply your battery needs for years without taking up much space or weight. with current low energy electronic and lighting devices, AA and AAA batteries will supply almost all battery needs.

10) a mag striker is also useful it's very small and light yet can start hundreds of fires and is utterly weather and water proof. nor will it ever wear out or mechanically fail. which if you are in an emergency situation with one disposable lighter in your pocket, well, we have all had a disposable die on us while it was still almost full of propane.

14) small hand axe is good, but when it comes to cutting wood, which happens a LOT in a survival situation, there is no substitute for a good quality collapsible camp saw. the best quality you can reaseach can dig up. and a diamond sharpening tool. tapered, flat on one side, rounded on the other.

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1). sprouting seeds provide the most bang for the lb. nutritionally. if you have access to sufficient water and agreeable temperatures. alfalfa or clover are the best all around.

2). in addition to a regular purifier, a uv sterilizing wand using rechargable aa batteries is very small and light, is highly portable - can be carried in you pocket, can sterilize water in any shape container including your cupped hand, will never clog, need a replacement filter, a brush cleaning and will last almost indefinitely.