Twenty-eight states have an official state drink. For several in dairy country, it is milk. In California, it is wine; in Maine, Moxie; in Indiana, water. Dine around Rhode Island and it becomes apparent what the Ocean State’s official drink is: coffee milk. It is mild stuff — more milk than coffee, and more sweet than caffeinated. Food historians speculate that Rhode Islanders’ passion for the pale tan beverage (as well as for coffee ice cream) owes to an Italian heritage and the old country tradition of gentling strong coffee with milk and sweetener. Add a scoop of ice cream to coffee milk, as can be done at Gray’s, and you have a coffee cab (short for coffee cabinet) At Olneyville New York System and Wein-O-Rama, it’s just the right beverage to accompany the state’s unique wieners up the arm, and at the down-and-dirty food truck known as Haven Brothers, it pairs well with a 3am murderburger.