Both, [ bucky counters immediately — apparently being irritatingly responsible tonight, because he's not having yelena dehydrate from bloodloss on his watch. nat would never let him live it down, if any harm came to her sister while he was supposed to be looking after her. but he does comply: wanders back into the kitchen, grabs the bottle of vodka (it's a good brand; he'd apparently picked up some knowledge over his years with the russians), pours a shot and hands it to her with one hand, the bottle of water in the other. and then stares at her, near-unblinking, while he waits to see if she'll drink both. and he goes ahead and says it: ]

Nat would literally murder me if you pass out from bloodloss at my place. So for my own survival: stay hydrated.