Since you've solved your problem, this is a moot point, but with the exception of having acidic water, a copper fitting or two isn't a big issue. We drink water from copper pipes after all. The bad "coppers" to have are mostly found in pigments. Copper sulfate being one. I'd worry more about the solder that joins the copper pieces together. Even then, it's really more of an issue when the water sits in contact with the copper or solder for long periods of time. If the water is constantly moving, it doesn't have the opportunity to pick-up the copper ions or lead ions from the solder. Again that too depends on how acidic the water is. With a normal pH range.... not a big issue.
Earlier, someone was asking about an ornamental piece being in contact with the water. I think that's where you got your info from. That's long term contact, but as part of the plumbing, if the water is always on the move, it's all good.