SEIF 11 (Cont.)
If someone has exactly one Rivious of wine for Kiddush, the Mechaber Poskins that it should be left for Havdalah. The Elya Rabbah says the implication is that this case refers to exactly one Rivious. If it is even slightly more, then the overage should be drunk for Kiddush and a Rivious kept for Havdalah. If possible, it is only necessary to drink a Malei Lugmav.