Q. See question above. Thanks for that unusual answer. I wonder if it does it also apply to drinking, like sipping from a coffee or a soft drink while walking to one’s car, that I have seen some Bnai Torah also do?

A. Siach Yitzchok (479) mentions that we usually maintain that in general drinking is included in eating, so it should be prohibited.
Yet, it is mentioned in a story (Brochos 54a) that Mar Breih Deravinoh was thirsty and miraculously a water source appeared to him in the street. However, he debates whether that could have been a just life saving case.

Curiously, once upon time, Poskim dealt with the shaila of smoking in the street.

Rabbi A. Bartfeld as revised by, Horav Dovid Pam, Horav Aharon Miller, Horav Chanoch Ehrentreu and Horav Kalman Ochs Shlit’a