If somebody from another table sends me a bottle...

If an acquaintance that I know marginally sends a bottle of champagne to my table, is it good form to go by their table at some time during the night and offer thanks, or is it better to just nod, and raise a glass to them?

Thanks,
hh

It is always good form to stop by and say thanks in person. The only exception might be an exceptionally crowded party where the chance just doesn’t arise, in which case you make sure to send a thank you note to the person the next day.