“bread.” Bread was the staple food. It would be in abundance at any feast, and also “bread” was put by metonymy for food in general. Sometimes we translate the Hebrew word “bread” as “food,” but in this case since “bread” was mentioned along with “wine,” the verse had symbolic and even prophetic overtones. God’s Wisdom provides bread and wine, in His wisdom God provided us with the body and blood of the Lord, which was symbolized at the Last Supper, and almost certainly by Melchizedek (Gen. 14:18), as bread and wine.
“mixed.” It was customary to mix wine with water. See commentary on Proverbs 9:2.