The Fourth Bottle (Solved)

[Kapra]

So I want to 100% complete the game. I am missing a few things. First off, I got all the power gems, all of the fat fairy upgrades, all of the great fairy upgrades, and the last sword, etc. What I still need is the last piece of heart and the red tunic. For that I need 6 shells. I only have 1. I think the rest of the ones I need are at the Witch's hut, I need to make the rest of the potions. However, I don't have the fourth bottle yet. Can somebody tell me where to get the last bottle from?

[Kapra]

After only an hour of running around, I managed to find the fourth bottle on the beach.