As some posters noted, this dude appears to be bad at swimming, boating, preparedness and common sense.
I managed about 5:03 on my 3rd try. I think I could do better if I let my toon take his pants off, which he was apparently trying to do, but I didn't allow due to my madly-incessant up-scrolling..
I am not a boater, or a swimmer. My mortal body has never entered water more than 10ft deep. However, even from the plane of my ignorance, I could spot some ways to stay alive not explicitly mentioned in this ad:
1) Float: Conserve your energy, turn on your back, spread out your limbs and relax. salt water is usually enough to keep you afloat.
2) Get rid of clothing: Boots, pants, coats, shirts, jackets, etc. got to come off. they just weigh you down. Even if the water is freezing, in the long run you're better off naked on the surface than clothed on the ocean floor.
3) Keep you core temp up: If you feel like you are freezing, start swashing your legs and arms. It should make floating easier and warm you up at the same time.
4) Stay awake: If you feel like you are about to fall asleep, take a deep dive under water and come back. It will wake you up. Chances are: You are not falling asleep; you are loosing your conciseness because your brain lacks nutrients or oxygen to stay awake or you are just too tired. Either way, a nice dip under water should get the juices going, that is, if you have any left.
5) Stay calm: This should have been #1. Your brain has to assume the coolness of a cucumber (or place your cultural coolness epitome here). This is true for all life situations though.
6) Finally: Check if you are in a swimming pool. If so, get your ass out of the swimming pool and sober up.
Still, even if you are doing everything right to survive, and you are in peak physical condition, without a life vest you have only hours until you drown. Wear a life vest or don't count on your body being found at all... maybe like parts of it inside your shoes on occasion on a beach somewhere currents flow close to.
Having a raft or a boat or any kind of flotation device will enable you to survive until you dehydrate or starve to death. Collecting rainwater and eating local animals are the only way I see to survive for more than a week. This may do you good if your rescue party zeroes in on your crash site after a few weeks of searching elsewhere. Otherwise, your best bet is finding an island where you can score some fresh food and water. And perhaps a payphone.
Either way, the only way to stay perfectly safe is to buckle up to your couch, grab a bag of chips and a huge bottle of soda. Now you are not in any danger. Enjoy!