In Assassination Classroom Season 2, episode 8, Tadaomi was fighting with Reaper, and then there was one incident where he faked his death from blood loss with the help of Koro-sensei. And then later it is shown that Koro-sensei was drinking tomato juice, and with the help of his one tentacles he faked that scene and helped Tadaomi.
So my question is: how did he get that tomato juice? Is it possible that he was keeping it from the start, or did he try to escape and then got one?