Here is a successful program taught to 4th graders in the public schools. This is for a winter environment with deep
snow.

As most lost folks are found in the first couple of days, the
focus is on staying put, staying warm, and helping be found.

http://www.tahoenordicsar.com/Education/4thGradeProgram.shtml

The main components of the "kit" can be carried with them
any time they are out skiing or playing-

clothes appropriate for the weather
whistle
large trash bag

additional items such as knives and matches are not included
as there is not time to teach about them to a degree
that would enable their successful use. Given the heavy
snowfall that occures in this area (2 to 3 feet each storm),
a fire etc. is very difficult to build and maintain.

Extras that are useful that we show them are:
avalanche shovel
headlamp
water and snack

We show debris shelters (use edge of snowboard or ski to
knock off green branches-we bring old christmas trees
for demonstration) and snow caves.