Isaiah 55:1 is an invitation to a food market, opened in the restored Zion. Like Lady Wisdom of Proverbs, she offers food and drink. The verse is chiastically organized:
A. come to waters and drink
B. without silver
C. come, buy
C’. come, buy
B’. without silver or priceA’. wine and milk
Two observations: One, that food is the central offer. And, second, that the initial invitation to drink water gets transformed by the end of the verse into an offer of the wine of festivity and the milk of the promised land. Like her Lord, Zion offers water and wine, water turned to wine.