The affected weapon can harm any creature, even those not normally affected by normal weapons. Notes Holy water is a good way to test for possessions or just cleaning off truly evil stains. On contact with the supernatural holy water burns and sizzles like acid. The difficulty depends on the amount of water being used. God doesn't necessarily require silver bowls and fancy robes, but it doesn't hurt to show your respects.
Damage listed is for all of the water hitting the target.
If someone gets the idea to coat the weapons with holy water, good for them. It'll add an extra d6 Wind and lasts for about 3 rounds of combat before gettin' slung off.