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I found a photo of a '67 442 with a washer bottle. It's right where Chris said it would be.
I have '67 chassis and Fisher body manuals as well as access to the 1967 A-body assembly manual. NONE of these, as far as I could find, show this bottle. I was surprised that the assembly manual didn't because it shows every detail, right down to where on the underside of the truck lid the jack instruction decal should be positioned.
I'm guessing this washer fluid storage bottle was optional, although I don't see it in the '67 Dealer Specs Book.