246 Cha

In episode 8 of Horimiya: Piece, we can see a closeup of a vending machine with various hot drinks. The one that I found the most interesting is the can of 246 Cha in the middle.
It is based on the real-life brand 16 Cha (Jūroku Cha) from Asahi, which is a herbal tea made from a blend of 16 plants.

As you may have guessed, the Horimiya: Piece version is supposed to be a blend of 246 plants. I would be very curious to see the full ingredients list for that.
The other drinks we can see on this are Dully's Coffee Premium Coffee which is based on Tully's Coffee Barista's Demitasse and Moontory oolong tea which is based on Suntory oolong tea.