Congratulations on your wrap! Welcome to the club! I noticed that whenever I ate something that irritated my wrap, I got some reflux feelings. My surgeon said that during the healing process, almost anything can happen, and that reflux was certainly possible. Also, though, the esophagus may interpret pain as reflux (I've heard it described as a "dumb organ" that can't differentiate between sensations.).
Before surgery, my reflux caused my asthma to be uncontrollable, and after surgery whenever I felt what I thought was reflux, I was fearful that the asthma would start up again. That hasn't happened, thankfully. My asthma is my best indicator as to the success of my wrap. So far, so good!
I don't think that most people find it helpful to drink carbonated sodas right away. Bea did sip away at a Pepsi all day in the beginning, and I'm sure it went pretty flat as the day went on. There's an option for you. If your stomach isn't reactive and can tolerate the acid, you could give regular coffee a try and see what happens. I think it would be better with food.
Good luck with your return to work. Just remember to follow your doctor's orders, and make sure you get lots of rest when you're home!
Again, I'm glad to hear you're doing well post-op, and are glad you're staying with us here at Healing Well!
We'll be here to answer questions, support your recovery, and cheer you on!