I've looked through the documentation and only found the suggestion to use virtualenv, but my machine doesn't have it installed so that's not an option. I also looked through the bootstrap-salt.sh script and haven't found any suitable options.
As the documentation suggests you should clone the git repository
$ git clone https://github.com/saltstack/salt
Then install Salt and it's dependencies using pip with the --user option
$ pip install --user pyzmq PyYAML pycrypto msgpack-python jinja2 psutil
$ pip install --user -e ./salt # the path to the salt git clone from above
That way you will be able to uninstall it easily with pip's uninstall command.