All foods combine with one another: to disqualify one’s body with half a peras; for the food of two meals for an eruv [techumim]; for the egg’s volume to transmit the tumah of foods; for the dried fig’s volume for carrying out [of a domain] on the Sabbath; for the date’s volume on Yom Kippur.  All beverages combine with one another: to disqualify one’s body with a revi’is and for the “fill of a cheek” on Yom Kippur.