The ability to survive outside / without a roof over one's head.

I'm not talking surviving solely off the land type of outdoor survival, although that is an excellent set of skills to obtain.

• Learn how to set up shelter, or find shelter if a tent / tarp isn't available
• Learn how to start a fire in multiple ways
• Learn basic hunting skills
• Learn how to sanitize / store drinking water
• Learn basic first aid
• Always remember the order of operations in a survival situation: Shelter, water, fire, food

Agreed - it's not a good adaptation of the book