morning drink question, picture from documentary

What is this man, Izakaya Toto, drinking right after waking up? Picture from the Netflix documentary Street Food, Osaka episode. Thank you!

\[Imgur\](https://i.imgur.com/RZF35dL.jpg)

https://www.reddit.com/r/japan/comments/14irq7z/morning_drink_question_picture_from_documentary/

1 comment
  1. Based on the color, probably oolong or mugi tea out of a pet bottle, with ice. Could potentially be a different type of tea.

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