Glass jar for Acid?!

[Oscar House]

Yes, you'll need to find the glass jar to store acid in. It's further in the prison.

Detailed help:

Spoiler below!

When you come out of the tunnel, take a left and keep going, taking a left at the crack in the ceiling. Go right in the intersection, then through the long corridor with the cells and at the end turn right. Go down the stairs, head into the room, glass jar should be there.

PS. Chemistry pot got blown up already.