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The ability says that it can only be used once per day, but does that mean a bloat mage can only drink a blood-potion once/day or that he can only make a blood-potion once/day?
Re-reading it, I'm not sure.
It could easily be read as "1/day drink fresh, bottle, or drink bottled" or "1/day drink fresh, bottle; Unlimited drinks of pre-bottled blood".
I'm guessing RAI is more restrictive, but it's not clear from the text.