Holy Communion or the Eucharist is one of the key sacraments ordained by Christ, to be observed by the Church, the body of Christ in remembrance of Him. Therefore, being a divine injunction, Christians must therefore, of a necessity keep it.
The realities of our world today as manifest in spread of diseases and other contagions warrant that utmost care be taken and ways be devised to ensure that the sacrament of the Eucharist is practised nevertheless.
Therefore, while it may not be safe healthwise to share or drink from same cup, it is absolutely ok to use Disposable Holy Communion cups