The basic formulation for summer grade windshield washer fluid is water and a few drops of surfactant - car wash soap will do. Oh yes, a drop of coloring - you select the color. I'd rather skip color, it has been known to stain paint.
For winter use, add some alcohol to prevent freezing. About one part alcohol to 2 to 3 parts of the summer mix. Methanol, ethanol or 2-propanol(iso) will work. I usually use a mix of whatever I've got around the lab.

dave and Xtoy - ya can't go if ya can't see