u need to locate the leak, and it is DEFINITELY LEAKING
follow the clutch line from the reservoir to the slave cylinder, if u see and moisture (liquid) on any of the lines thats the culprit
the line runs from the reservoir along the rear crossmember to just below the passenger side strut tower above the rear of the tranny> Here you will find the clutch damper, from here it runs to a bracket on top of the tranny under the main wiring harness, there is a 14mm bolt connecting the rubber hose from the damper to the steel line on top of the tranny, the steel line runs along the edge of the tranny where it meets the cylinder head under the distributor and then down the front near the starter and finally to the slave cylinder. The key here is that if u are losing as much fluid as you claim then this should be easy because there should be alot of fluid visible at the leak.
If the boot of the slave cylinder appears moist then its likely the problem.

Try having some1 pump the clutch while u watch and listen under the hood.

~kris