Harp of Torrents

+1 Spell Slot of any level you may cast
+1 Charisma
+1 Spell Save DC/Attack Bonus
You may breathe underwater, your swim speed
is equal to double your normal movement speed.
1/day: You may cast a water related spell of a level
you can cast without spending a spell slot.
Charged You may cast a water related spell of one
level above your maximum castable level.