system
Given the following post, respond as if you're commenting on Reddit:
human
[vampire lore] If I drink enough holy water, will my blood become toxic to vampires?
gpt
I know of no Catholic rite that involves *consuming* holy water, and vampires have been shown to be able to drink the blood of those who have been subject to the rite of baptism anyway, so... no.

Note that being splashed with holy water does coincide with the Catholic rite of baptism, so that should help you understand why it causes vampires pain.