Leanto shelters keep you dry during the night to survive in the wild

Leanto Lean-to Survival Shelter,
The lean-to shelter is probably the simplest and fastest shelter to construct. You need a horizontal branch which can be tied between two trees or supported by two branches. Then branches are leaned against the windward side to create an angled roof. The roof can than be covered with branches grass or a tarp if you happen to have one.
This is the traditional Way for Quick Shelter in the wilderness.

Leanto
If you need to heat your shelter, build a small fire approximately one pace from the front opening. Behind the fire build a reflector wall. This is a short wall which will reflect the heat from the fire back into the shelter. If built properly, this shelter will keep you warm and dry.

If building a survival shelter is possible a lean-to shelter is probably the easiest and quickest type of wilderness shelter to build. A lean-to shelter is suitable for most terrain. Always build this type of wilderness shelter with its back to the prevailing wind.

Check out the survival facts on how they intend to go about it.