Low tech chemistry
Low tech chemistry, seperation by weight, boiling point, etc. Manual creation of pills.
I know of a few ghettochem implementations that are decent in a couple TGstation derivative codebases. Not sure how compatible the chem here is with TGstation chem. But if it is similar enough I should be able to port a bit.
Mortars can act as ghetto grinders. And bottles and plastic could be formed into less effective seperators. With those and a hydro setup you can do a decent chunk of chem stuff. Albeit in a more time consuming way than if you have proper equipment. I could also easily add some lower quality medicines that can be synthesized without advanced equipment as well.