- fire
- shelter
- food
- water
- signaling (This is important and one of the basic 5; you need to signal to alert others of your location to help you out of a situation. Signaling is using smoke, fires, colors, movement, signs, etc. as an S.O.S and/or HELP. But, you do not need human contact to survive. Think of the movie "Castaway".)
Source: Every signal survival guide and manual
(Note: To those replacing "signaling" with "human contact" is wrong and misleading - because one does not need human contact, at least not for companionship, to survive - other than knowing and continuing to signal for attention so that someone, yes hopefully a human, can rescue you if you are stuck in the middle of nowhere or on a deserted island, mountain top, etc.)