SPOILERS OMG! how to get holly water:
In the upstairs bedroom, before the bathroom, examine the nightstand you will find some weed. Go downstairs to the TV, and turn it on. Now use the weed. You must have the lighter in your inventory for this to work. You will trip out and have to escape fred in a dream sequence. Survive and you will get holy water, to use in the final boss fight.
END OF SPOILERS
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