If you need water, dig a hole about 1 foot deep, and 1 foot wide, and place "green" vegetation inside the hole. Place a cup in the center of the hole. Cover the hole with a plastic sheet. Put a rock in the middle of the plastic and wait a few minutes and water will be dripping into your cup.
If you need a fire, take batteries(2) from a flashlight. Touch both sides with steel wool and suddenly you have fire.
Use a mirror to reflect light from a flashlight at a plane.
Some ways to get attention are to blow your whistle 3 times. Light three fires in a triange. Shoot a gun 3 times (wait 10 seconds after each shot). Flash mirror at a plane or truck, DONT BLIND THEM!!!
STOP-Stop, Think about situation, Observe things around you, you may not recognise the area but could only be 50 feet from where your camp is. Make a Plan.
you can live 3 weeks without food, you can live 3 days without water, you can't live if you don't have a shelter. Without a shelter people become nervous about the place, and it protects you from the weather.