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Near the village where you get the boat, there is a flooded cave that I can't figure out how to enter. Any hints?

You need the Aqua Lung spell from the library. 

Return there, search for the book, Mercury will study from it and then Bam! You'll be able to enter into the cave.

Also, make sure that you donate to the town mayor to learn that you need the spell first.

OK, I got the item. Trouble is, despite the game saying Mercury learned the spell, when I try to enter the cave it just says the cave is flooded. The Aqua Lung Spell is in my key items, but not in Mercury's spell list. Is this another glitch, or do I have something else I need to do?

Nope. If you have the book you are good.

Did you give money to the town mayor?

Yes, both before and after getting the book. Second time got me a Tear Of The Sun. Funny thing is, after saving and loading my game, I tried to enter the cave again, but it still said that the cave is flooded. After that, I tried to pay the mayor again, and he gave the hint again, after which I could enter with no problem.