30. When Holy Communion is to be distributed under both species, careful planning should be undertaken so that:
enough bread and wine are made ready for the communication of the faithful at each Mass.45 As a general rule, Holy Communion is given from hosts consecrated at the same Mass and not from those reserved in the tabernacle. Precious Blood may not be reserved at one Mass for use at another;46 and
Diocese of Austin Guidlines for Extraordinary Ministers of Holy Communion
USCCB Guidelines for Extraordinary Ministers of Holy Communion
Seven Questions on the Distribution of Holy Communion Under Both Kinds
The Real Presence of Christ in the Sacrament of the Eucharist: Basic Questions and Anwers
Rite of Commissioning Extraordinary Ministers of Holy Communion