Help! I'm at the lake on Level A, and I can't swim! What do I do

Hint 1 of 3:

You need the Buoyancy and Breathe Underwater spells to survive the lake

Hint 2 of 3:

Good News.  To mix Breathe Underwater, you need anything edible

Hint 3 of 3:

Bad News.  The Buoyancy spell ingredients are in the catacombs in Studio 3