He's giving them to everyone. A hangover cure that's guaranteed to work, coming from him.

[ Giles hadn't been fully awake and cognizant when Ossie had left on his endeavour to perk everyone up, but he'd pieced together the general gist of it ]

He's trying to keep everyone in good spirits, I believe, embracing his role as a representative of the court of Spring. It's good to see, after how tumultuous the past few months have been.