Sadly, none of my doctors will let me count coffee as part of my water intake. The fact that is is more than 99% water by weight seems not to convince them at all. 🙂 Seriously though, when I was first diagnose with HCM, I was told to increase my water intake significantly; it would help with the HCM overall but would also help with the specific symptoms including dizziness. Occasionally I'm even good at that, but when I'm not, I can feel the difference - not just the HCM, but general well-being. Maybe doctors actually know what they are talking about!