As soon as Snake sees the flask, he groans in exasperation and walks over to snatch it from Raiden. Thankfully his reflexes and reaction time are awful due to the haze of the booze, so he has little chance of being able to stop him.

Snake screws the top back on and then tucks it into the front pocket of his pants. He should just go dump it all out into the sink, but he'll do that after Raiden's asleep.

"I'm gonna get you some water, and you're gonna drink it. And then you're going to sleep."

No if's, and's, or but's, young man!