All you need is a phone, it doesn’t need to be fancy. It doesn’t even need a plan. You can download the authenticator app over a wireless connection. Or download the Authenticator .apk file on your computer and use a USB cable with the phone to install it that way.
If the tablet runs iOS (apple) or Android, then it can download the app that way.
Or you can use WinAuth to have the authenticator on your computer.