How do I get the blue stone?

Hint 1 of 6:

Notice the trickle of water on the wall?

Hint 2 of 6:

Didn't another room have this same water?

Hint 3 of 6:

Maybe there's a way to get to it from above!

Hint 4 of 6:

You'll need a way to make a big hole.

Hint 5 of 6:

Go back to the Dungeon Room.

Hint 6 of 6:

Put acid on the floor.