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One useful way I've heard to remember it is the rule of 3's:

You can survive approximately: 3 minutes without oxygen, 3 hours of exposure (core temperature), 3 days without water, 3 weeks without food

Supposedly the special forces add to this "3 seconds after a bad decision."

3 cycles after a bad instruction?

3 seconds after the LT makes a bad decision

3 funding rounds later

Sure, but unless your airways are obstructed, that happens automatically.

Maintaining core temperature is something you must actively manage, just as water intake is actively managed.

Fair, until you try to maintain #1 by building a fire inside your closed off cave :P

Also fair. At that point, though, if someone's out of water and in a survival situation, and lights a fire in a cave like that, well... I'd be doubtful they've got the outdoor knowledge to hack it.

ABC’s, Airway, Breathing, Circulation. Having said that, it’s clear in context that survival needs referred to external factors such as food, water, shelter, and fire.

Oxygen is external, we just generally don't need to worry about it.