you could likely find a decent looking washer fluid bottle, even with a built in washer pump, by a walk around at the local pick n pull. even a browse on the dorman site may help.
something like this may work, universal, but there are others that may also work and apeal to your eye more. even try some for highway trucks as they usually don't conform to a body shape and mount against a flat surface.
https://www.amazon.ca/Dorman-603-540.../dp/B007IS2YEC
https://www.raneystruckparts.com/fre...kaAigPEALw_wcB