My boss offered me a cup of coffee during the interview.I wished it to come after my interview was over but it just arrived so soon. I have got the job but want a tip for future. Should i have drunk it with him or drink after the interview ended or should have just left it ignoring.

Drink 2 or 3 small portions WITHOUT MAKING NOISE when the interviewer is talking. But keep eye contact with him/her and make the movement of picking the cup and putting it down smooth, natural and firm. No spilling please.