[header] How to build a fast shelter in the wilderness [title] Look for natural shelter features. [step] Search in your immediate wilderness area for land features that could act as shelter. These will be the fastest forms of shelter you can make. 
[substeps] Caves or rock outcroppings that hang over your head are simple natural shelters. Build a fire in the entrance to a rock dwelling, to both smoke out any critters living in it and to warm rocks in the fire that you can then put around your body for warmth while sleeping.