We know that he, salla Allahu alaihi wa sallam, used to eat ripe dates and if not then he would eat dry dates and drink water if nothing was available.
I don’t know any mentioning of milk while breaking his fast. We also don’t have anything specific that he used to eat as well.

Sheikh what did prophet muhammad break his fast with aside from dates and milk? Any other types of foods recorded in history that he would break his fast with? Also, do we break our fast with dates and then pray magrib or do we eat the entire meal first and then pray?