I neglected to include solar ovens, parabolic cooking/heating and fresnel lens cooking/heating in PTE part 2. They're almost a separate category anyway.
Some of the best YouTube channels I have found using parabolic and fresnel lens generated energy is Dan and Denise Rojas' GreenPower Science. The channel itself is located at http://www.youtube.com/user/GREENPOWERSCIENCE. They tend to do more with fresnel lens than parabolic, but they really know their stuff, and a simple YT search on parabolic cooking including DIY builds will round out any gaps.
Solar oven cooking or its companion solar oven bag cooking is something you should have in your arsenal. Solar cookers constructed of car windowshades and Reynolds' turkey or oven bags like these http://solarcooking.wikia.com/wiki/Windshield_Shade_Solar_Cooker are lightweight, portable and cheap, in other words, perfect for a bug out bag.
Solar ovens like the Global Sun Oven by Sun Ovens International, won't fit in a bag pack per se, lol, but they are lightweight, easily movable, built for durability and reach temperatures similar to a regular oven, so a lot of the uneasiness or guesswork is removed.
Traditional sun ovens allow you to do more than just cook. It is easy to boil water in them, melt and clean beeswax, dehydrate...so a solar oven is a pretty versatile tool.
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