Most any survival situation will have several common factors that will affect your ability to survive. Following the Rule of Threes will help you keep your priorities in order. This will help to give you a better chance of surviving.
THE RULE OF THREES
3 seconds: The amount of time you normally have to respond to any threat.
3 minutes: The amount of time to obtain breathable air.
3 hours: The amount of time before you will need some form of shelter.
3 days: The amount of time you will have to find safe drinking water.
3weeks: The amount of time to find safe and edible food.
3 months: The amount of time before you will need contact with other people.
Staying above the water line!