GMC 1994 Sonoma Owner's Manual page 84

Driving without washer fluid can be dangerous. A bad mud splash can block
your vision. You could hit another vehicle or go off the road. Check your
washer fluid level often.
NOTICE:
When using concentrated washer fluid, follow the
manufacturer's instructions for adding water.
Don't mix water with ready-to-use washer fluid. Water can
cause the solution to freeze and damage your washer fluid
tank and other parts of the washer system. Also, water
doesn't clean as well as washer fluid.
Fill your washer fluid tank only 3/4 full when it's very cold.
This allows for expansion, which could damage the tank if it is
completely full.
Don't use radiator antifreeze in your windshield washer. It
can damage your washer system and paint.