@hungryphrog
That's a difficult one. On one hand if I went to the early/mid Victorian era, it'd be pretty easy to re-invent some shit, and I wouldn't have to worry about having to re-learn reading in the local language, but on the other hand it's... the Victorian era.
Antibiotics isn't as simple as simply getting a fungus to grow in a medium (such as penicillin in cantelope): there can be bad byproducts that also need to be removed, and scaling up the growth to significant quantities can be a big problem. What miiight be easier actually is using viruses to kill bacteria, but you need access to good quality meshes. And industrialization also isn't as easy as some books make it seem.
I think I'd take one for the team and go back to some ancient mostly egalitarian (but still some excess goods to support specialists) queer friendly society guaranteed to not immediately get wiped out, and get them started on the scientific method early, and hope to butterfly/forewarn the worst shit away.