I was not told I had to stay off carbonation forever. I don't really care because I never was much of a soda drinker. The Doctor and Nutritionist said it is a myth that it wil stretch the pouch, but it can cause gas and make you very uncomfortable. As you get further out it maybe tolerated.
Once on regular food I was told I can eat anything that I could tolerate but that didn't mean I should. My Doc is all about Protein first, veggies second and you probably won't have room for starches. Further out I hear a lot of people say they eat popcorn. Good Luck!