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Sea Touch ElixirItem 5+

Alchemical Consumable Elixir Polymorph 
Source GM Core pg. 247
Usage held in 1 hand; Bulk L
Activate [one-action] (manipulate)
his briny concoction alters the skin on your hands and feet. The spaces between your fingers and toes become webbed, granting you a swim Speed of 20 feet for the listed duration.

PFS StandardSea Touch Elixir (Lesser)Item 5

Source GM Core pg. 247
Price 22 gp
The duration is 10 minutes.

PFS StandardSea Touch Elixir (Moderate)Item 12

Source GM Core pg. 247
Price 300 gp
The duration is 1 hour, and you can breathe underwater.

PFS StandardSea Touch Elixir (Greater)Item 15

Source GM Core pg. 247
Price 920 gp
The duration is 24 hours, and you can breathe underwater.