What engine does your WK have?
Since the reservoir was empty the radiator was also likely low and needed to be filled too. Hopefully the engine cut off was due to something else besides a major overheat. Look for the CEL and codes stored.
What are the present symptoms (totally dead, clicks but no crank, cranks but no start, starts and dies)?
06 Laredo - 4x4 V6 - Stone White - Custom LED Cargo Area Lights, Lighted Visors Added - now at 49k miles
97 Laredo - 4.0 4x4 Daily driver for 8 years then relocated to Arizona for 6 more years with the relatives