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@Earth
(Ok, couple of things:
Holy Water can be made in two ways:
1. "A Cleric or Paladin may create holy water by performing a Special ritual. The ritual takes 1 hour to perform, uses 25 gp worth of powdered silver, and requires the caster to expend a 1st-level spell slot."
2. Alternatively, if they have the "Ceremony" spell, they can do it the same way as #1, but also have the option to cast it as a ritual, meaning they preserve the spell slot (still requires an hour and 25 gp worth of silver).
You can spend an action studying a creature to see what you can discern or remember about it and I'll make the appropriate check.
For Grahf, are you looking for secret passages? Or just determining which existing passage leads the quickest way out?)