My new custom story - The Visitor

[Guanjyn]

Hi I just joined because I'm stuck on this custom story and no one has made a let's play of it. First off, just want to say, well done, and it's going great so far. Been playing through as much custom stories as I can find. Now my problem:

Spoiler below!

I have the container, and the lantern. I've completely searched the only 2 rooms unlocked in that first main hall, and can't for the life of me figure out what to do next. I've tried to use the container on the bucket of water and that doesn't work. There are 2 doors I need to unlock. 1 in the lab, and the other in that room with stairs where there's a boarded door and a brute trying to break out. Is my game glitched or something? I've searched every where and can't find any key or chemical. Any help would be much appreciated. Thanks.