Can you get Twitch Prime without Amazon Prime?
If you are not an Amazon Prime member, you can either join via Twitch or via Amazon.
To join via Twitch, go to https://www.twitch.tv and select the "Sign up" button on the top-right part of the page. Fill out the “Sign up” form. Choose a username, set your password, email and date of birth.
Some countries cannot access Amazon Prime or Twitch. You will be notified during the signup process if your country is not eligible. If you’re in a country where Amazon Prime is not available, you may still be able to access Twitch Prime by purchasing Prime Video.