Q. On Rosh Chodesh there is a mitzvah to increase in eating, and even to have a seuda with bread (not an obligation). A working person who is at work basically the whole day and shkia is very early - how is he to be mekayem this mitzvah (it is not always possible to wash for bread at work due to lack of sinks outside the bathroom....)? And sometimes one is so busy that he doesn’t even eat lunch at all. Perhaps one can fulfill the mitzvah by just having a special drink?
A. Horav Shlomo Miller’s Shlit’a opinion is that you can comply with the seudas Rosh Chodesh requirement, by eating mezonos when in need.
Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a