Q: A question has come up about adding a drop of water to wine at the Preparation of the Gifts that I have not found detail for in the Roman Missal. The deacon has been adding drop(s) of water to the flagon first, praying the prayer that is his part, before filling the Celebrant’s chalice. He then fills the cups used for the people.
Is adding water to the flagon or only to the Celebrant’s chalice proper?
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A: Take a look at the bottom of page 19: http://www.usccb.org/
I’d say that best practice is to add water to one chalice. As the saying goes, “It’s a symbol, not a recipe.”