Wine and grape juice:
By wine and grape juice some question whether the shiur for an after blessing is a Kezayis [i.e. 30cc] or Revius [86 cc]. Practically, in order to avoid this debate, one is not to drink between a Kezayis and Revius of wine or grape juice [i.e. 30cc-86cc], however if he did then no after blessing is recited.
 Seder Birchas Hanehnin 8:1; Admur 190:6; 472:19; Michaber 190:3