Where and how to refill the water for the window washer
Open the car/vehicle bonnet and find your washer fluid reservoir. This it’s usually a white, translucent container with a windshield/water symbol on the cap. If your vehicle has a rear wiper, there may be a second reservoir for it as well. Remove the cap or caps as appropriate and check the fluid level in the reservoir(s). If it’s full, you don’t need to add any. If the fluid is low, carefully pour some into the reservoir(s) until it almost reaches the top.
Replace the cap(s) and press down until it pops into place. Then, close the bonnet.