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There is a Legacy version here.

PFS StandardPotion of Water BreathingItem 3

Consumable Magical Potion 
Source GM Core pg. 260 2.0
Price 11 gp
Usage held in 1 hand; Bulk L
Activate [one-action] (manipulate)
This filmy, gray potion reeks of ocean detritus and tastes even worse. After drinking this potion, you gain the effects of a 2nd- rank water breathing spell for 1 hour.