An eye-wash is either a little cup (about 30mL) in which water
is poured, or a device much like a water fountain
, with a pair of spouts that sluiced
water onto the surface of the eye.
For any worksite in British Columbia that handles hazardous chemicals, the Workers' Compensation Board requires there be some sort of eye-wash present. I doubt that this eye-wash solution would include any tear gas.