I guess I’ll start by saying Ramadan mubarak to everyone. Hamdullah Allah allowed us to live so that we may harvest what we sowed.
As for the rose water, here’s the story. My mom gave me her oil burner (the kind that you get from the body shop to burn scented oils). She told me to try putting rose water in it. I gave it a shot and it worked. My apartment smelled great. I then tried drinking it, as it was originally intended to be used. The taste was pretty good. However, I later noticed that the fumes in my breath smelled like rose water. I remembered that Imam Ghazali mentioned something about rose water emitting fumes (in his Deliverence from Error). I also reflected on how adding heat to the rose water in the perfume burner caused it to emit fumes that smelled like roses. Perhaps the acid in my stomach mixed with the rose water and caused similar fumes. What I did know is that the hardest part of fasting for me is not the hunger or the thirst, it is the taste of my breath. So I tried some rose water for the pre-dawn breakfast and my breath, though still bad, has not been as bad. I’ll keep trying it out and see what happens.
As for the fiqh on it, I had some questions. Introducing anything in your mouth that changes your saliva breaks your fast. Does that mean that rose water invalidates the fast? I don’t think so. My reasoning is that (a) you are not introducing anything to your mouth (though you do have to wash out your mouth before fajr) and (b) if the fumes from rose water would cause your wudu to break, then so would the fumes from all the other food you eat. Then again, I don’t know that much. If anyone has any insight on this issue, please comment.