Q. We know that one can drink water, coffee or tea before davening shacharis to help concentration, even with milk and sugar. My question is; if a person is accustomed to drinking black coffee, is it mutar to decide to drink a coffee with milk and sugar before davening shacharis? Or would this be improper? Shkoyach
A. Horav Shlomo Miller’s Shlit’a opinion is that it if it helps to concentrate better and have more kavana, it is permitted.

Rabbi A. Bartfeld as advised by Horav Shlomo Miller Shlit’a