Glass jar for Acid?!

[brown8775]

I've already crawled through the tunnel in the prison. I found the kitchen with the large vat of acid, yet I have no glass jar to put the acid in!! Where do I find this jar?! Is this how I get out of here, because right now I am trapped. I tried to stack crates to jump through the crack in the ceiling at the top of the stairs past the "Storage" sign, but that didn't work either. I also tried to crawl back through the tunnel thinking I have to go back to find the jar in the earlier part of the prison, but it won't let me crawl back through.
Please help!!
Thank you...