[mixmastamyk]

He writes about downloading all necessary docs beforehand. Also, it isn't hard to run servers in virtualbox or containers if you need them. That leaves slow internet for occasional searches of stack overflow, which is doable.

[mrob]

If you don't mind slightly outdated data, you can download and browse all the Stack Exchange sites offline:

http://stackapps.com/questions/3610/stackdump-an-offline-bro...

https://archive.org/details/stackexchange