Q. Rov. Does the mitzva of eating on Erev Yom Kippur mean just eating one seuda in the morning and then another before the fast begins or the Seuda Hamafsekes, or does one have to eat the complete day? If yes, does one have to eat a Kezais each time?

A. Horav Shlomo Miller’s Shlit’a opinion is that if possible a person should eat as many kezaisim or olive volume pieces of bread during the day, since each one is a mitzva by itself.
However, since likely it will not be possible to eat constantly, he advises to do what other great Tzadikim also did, and that is to suck a candy as long and constant as one can on that day, as it is also considered as eating on that day.

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