What do you do to prepare for an interview? Doesn’t have to be fluency related.

What do you do to prepare for an interview? Doesn’t have to be fluency related. Hello all! I am in the process of interviewing for 2 positions on Monday and am planning for success. I made a list of potential questions, and am going to have my fiancé ask me these during a mock interview. I have had 2 prior interviews elsewhere, but didn’t get the job with 1 partially because I wasn’t prepared for questions and the other I got but the pay and benefits were ridiculously low. So now I’m here with 2 awesome jobs hoping I can get one and can end the search. Mock interview, dressing in business professional, any other advice? I want to take my own water so I can sip and help with my blocks but not sure if that’s even more distracting.