I agree it won't go bad. If it does anythign to your stomach it will be gas from carbonation no matter how "fresh" it is. I printed a thing out and put it on my fridge that has all sorts of how long things are good for and it says soda will not go bad only have its taste affected and depending on packaging and whether or not it is diet is good (flavor wise since it cant' go bad) from 3-9 months AFTER best by date. So you will be fine! Hope your'e cramps ease up! I hate them!
\"As soon as you trust yourself,you will know how to live.\"
Johann Wolfgang von Goethe
\"Do not anticipate trouble, or worry about what may never happen. Keep in the sunlight.\"
Benjamin Franklin