No diet soda is good for you whether on protocol or not. how about making own sun tea with lemons in it or at night take a quart jar of water, put slices of lemon and chill over nite. As you drink water during the day add water to the jar. add sliced cucumber too, plus a few slices of strawberry. don’t worry, considering IP says no soda, and the coach says it is ok anyway, one strawberry will be ok. If the addiction to soda is so bad you can’t give it up, put the tea in a soda can till you can. Just a thought