To dream of coffee represents situations in your life where you are getting acquainted with something or someone. Something new that you are getting to know, becoming familiar with, or trying to understand better. An introductory process in your life.
Alternatively, coffee may reflect a new aspect of your personality that you are becoming aware of.
To drink coffee with a person is a reflection of how you are getting acquainted with that person in waking life. It may also reflect qualities you see the most in that person slowly becoming more apparent in your own life.