There is an option to use Google Docs offline without WiFi access but then later you can save the documents to the cloud.
To enable the option to use Google Docs Offline without WiFi go to the Google Drive Page and click on the gear icon which is located in the upper right corner.
Then click on setup Google Docs Offline and after doing that a window will popup that has a two step setup process.
Then click on the button Enable Offline Docs and then when step 2 comes you will install the Drive Web App for your browser.
It's best to use Google Docs online but you can use it offline as well.