All of the water just literally poured out onto the ground. on 1997 Buick Skylark

I was at a red light when my car shut off n wouldn't start. After we checked the battery and oil, all of the water out of the coolant reservoir poured out onto the ground. We filled it back up, and a few days later I'm at the store and it all pours out again.

Asked by for the 1997 Buick Skylark
Have the radiator cooling fans checked for proper operation. That's a good place to start with!