yeah, you cant tell the difference between your body being "thirsty" and "hungry" (obviously you can feel thirsty and hungry but most people eat when they really need to drink)

Yeah, I only drink "still" drinks on the course, usually a lucozade sport.
Chocloate is also good, but dont go crazy or you will have a "come down" from your sugar buzz on the last few holes and your concentration will vanish.