He is beside the Coconut Cafe and will give you carbonated coconut.
there are two: main street and booga bay
When you arrive on the island, get a free sample of carbonated milk from the vendor on Main Street.
From the street vendor when you first arrive on the island. Click on the surfer guy.
The vendor is giving out free samples near the beginning of the island, on Main Street.
He's on main street. The vendor there will give you some coconut milk.
The ruins are just to the right of the first village (Main Street) on Shark Tooth Island.
He is beside the Coconut Cafe and will give you carbonated coconut.
Shark tooth island is when you have to to save people from a giant shark
The coconut milk is from the vendor on Main Street. The other two items (the bone and the key ingredient) are in the underground ruins. (see related question)
The ingredients on Shark Tooth Island are1) coconut milk (from the island vendor on Main Street)2) a dinosaur bone found in the old ruins3) the green "key ingredient" also in the ruins at the far left of the cavesYou also have to have a grass skirt to convince the native man to make the potion for you. He is found at the top of the "tree" next to the ruins..
You don't need a mask, just a grass skirt. Get one from the vendor on Booga Bay.
There are no mermaids in Shark Tooth island, you do go into the ocean