If you want to install a bunch of dependencies from, say a requirements.txt, you would do:
You must have the requirements.txt file in the directory. Then in that directory do:
mkdir dependencies
pip download -r requirements.txt -d "./dependencies"
And, once you transfer the dependencies folder and requirements.txt to the machine which does not have internet you would do:
pip install --no-index --find-links ./dependencies -r ../requirements.txt
NOTE: Maybe the requirements.txt is not necessary on the other machine.
All of this can be don in a virtual environment for better package seperation.