The Chapin 6 Gallon Cart Sprayer (#6300) is ready to go! All you need is the sprayer the product and water!
Unfortunately, the manufacturer states that using vinegar will cause deterioration of the Chapin 6 Gallon Cart Sprayer rather quickly as it is not meant to handle acidic liquids, and they do not recommend using it for this purpose.
The adjustable nozzle for the Chapin Cart Sprayer 6 Gallon (6300) is the Chapin Brass Adjustable Nozzle 6-6000.