Basic survival facts
10 Wild Edible Plants to Save Your Life
Living Afield - Great Lakes Michigan Edible Wild Plant Identification
Common Edible Plants
Edible plants E-How
The first picture of a lean-to shows placement of fire with reflecting wood behind it to reflect heat into the lean-to. Stones can also be heated up and brought inside shelters which are more closed such as the last one. These offer more protection from mosquitoesand animals. But a fire is a necessity to aid in this. Fire safety is important. Consult survival books for other ideas.
Being able to build a fire is most important. This has already been covered on the scouting page.
More to be added.