I don't think there's anything wrong with being aware of what's going on around you. You have set a boundary, or a line in the sand, and you are not staying in the dark if that boundary is crossed.You aren't discussing it with those who aren't equipped to deal with it, you're going to the appropriate resources to discuss your concerns.
If you were reading his text messages, contacting his friends, searching for bottles....that's codependency.
And, yes, they learn about products etc that they need to stay away from. Mine was also told don't drink water/soda etc from a wine glass. He was given a list of products to stay away from when he was in rehab. We watch mouthwash, etc. But it's up to him to apply the lessons.