Clutch Fluid Leak

[tntfox]

Almost overnight, my clutch pedal has almost no resistance until it is almost to the floorborard. There was a puddle of fluid under the left front of the car which I am assuming is clutch fluid. I had just enough clutch to get the car in gear, but not much more.

Can I just fill up the reservoir so to hopefully restore some of the clutch pressure so I can get it to a shop? If so, is the clutch fluid reservoir the small, round one that is mounted to the firewall next to the brake master cylinder?

All the caps say to use DOT 3 fluid, but all I find in the parts store is DOT 3 Brake fluid. Is this the same stuff?

Thanks

'91 RX7 Convertible