[elkston]

You only get 1000XP for cleansing the crypt, so I wouldn't
waste too much time worrying about finding some Holy Water.

It's funny. I finished the game last month, and I had catzandpewter's exact dilema in just *finding* some holy water. Everyone talked about it as if it was just commonplace and that it was a cinch to go buy it somewhere. I couldn't find or buy any anywhere at that time. Later in the game I found some and did the puzzle for the sake of completeness.