I'd buy the a couple liters of the cheapest brake fluid you can find
(W*alm*rt, Autozone, etc.).
Wear nitrile gloves.  Place many paper towels/ shop rags all around the res.
Empty the reservoir as completely as possible by attaching some tubing to
your turkey baster to reach deeper.  Flush new brake fluid into all 5
bleeders (remember the clutch?)
   Here's a similar procedure;

http://www.blauparts.com/audi/audi_fluid/audi_brake_fluid.shtml#howtofflushaudibrakefluid

Redo the whole job again sometime soon.

Mike B.