I would agree with sworkscooper, but I (and I suspect most others reading your first post) am asking) "How did your clutch master cylinder reservoir come to have an empty reservoir". Logically, there MUST be a leak somewhere, and that will HAVE to be found and remedied to arrive at a long-term or even medium-term solution. I strongly recommend that after re-filling and a bleeding of the system, you park your car over a clean sheet of cardboard or whatever, and check for puddles after operating the clutch pedal several times. If the bleeding does not yield a temporary fix, and there is no sign of leaks at the gearbox end, a new master cylinder will be the next thing to try.