A dream of serving a king with alcohol or food is a dream that suggests that your wish will come true with the help of your superiors. It can be promotion, employment, new business, or one’s work or idea can be honored by the recognition of one’s superiors. A president or king can be seen as a symbol of power and opportunity. Giving them something can be seen as an indication that they will receive something corresponding. The situation is in your favor, so if you take advantage of the opportunity actively, you will have good results.