OK, if the zombie apocalypse ever comes, I will definitely die of thirst because without this video, I could never figure out how to drink from the Ultimate Directions Kicker Valve.
There are two tricks. First, because it is a bottle for running, you have to pull the valve out with your teeth (Argh). And second, then to actually drink, you need to squeeze the bottle or tilt it up and then slight bite the neck so that the nipple opens up. Yikes, not easy, but very secure.