The spell Commune specifys
(incense and a vial of holy or unholy water)
obviously, holy water and incense have a definition but I couldn’t find a definition or cost for "unholy water". Since it is assumed that a component pouch/focus ignores material components without a GP cost, would you have to pay for the incense and holy water?
What is "unholy water"? related to the definition of unholy water however no RAW answer