Drinks sweetened with Stevia may be ok. I guess each person has to experiment. I've read that artificial sweeteners alter the gut flora in a bad way.
Spices - I meant dried form powdered spices. Yes n=1. I found this out when I read of cinnamon benzoate free diet used to treat other conditions.
I went from drinking a lot of coke / soda / fruit juice drinks to the natural progression of cutting back on sugar. I kept drinking sugar free versions of various drinks for a long time. I then cut them completely as they had a negative effect for me. If you drink one, it's not obvious and may not be an issue. Drinking those things every day... maybe some people are ok but eventually my body rejected that.
Water, tea, coffee are ok in my experience..
I am not claiming a cure, I added suggestions to include with the parent posters advice that I found helpful. As always work with your doctor and follow their advice.