That's so sweet! And in some sweet way it's nice to know that they already had been taken care of and you checked up on that and confirmed. :-) Whether they needed the cold drink or not, I'm sure they felt the love in each interaction. And isn't it really just all about that?
It reminded me of the time you got cake for the homeless woman on her birthday. So nice to know they're are people like you in the world. :-)