(As a point of reference - I've been banded almost nine months. I've had fills and if I'm not in the green zone, it's at least sea foam green. ???Š)
I did not have to do a pre surgery diet. That varies by doctor/insurance.
There are no foods that I cannot eat. I do not have carbonated drinks very often. I've had a beer at a couple of social events but drank them very slowly as I could feel the gas. I have gotten stuck before but if I chew, chew, chew I can eat anything. But there's a lot I don't eat as I count calories and get in the needed Protein. And I eat a cup or less of food per meal so that doesn't leave much room for a lot of things. I have had a cupcake at a birthday celebration or even some chocolate just because but I count the calories and usually a bite or two us enough to feel satisfies.
For me the band has not been about giving up foods. It's been about eating healthier and smaller amounts. Hope this helps you.