I assume that this happens in every container, even brand new ones and that it's odorless.
By white film, do you you mean "oily white film" over the surface of the water? Or do you mean along the edge of the glass, but not the surface? Hard water can sometimes leave a residue if allowed to dry along the edge.
Beyond the obvious, it means your water needs to be tested so you know what's causing that. That's not "just" water. Call the water company and ask them what that is and either they will know or they will want it tested.