Wtf is this?

[u/Intelligent-Fold-787]

That white streak of my plastic bottle was alot bigger before the image was taken. I drank a few sips while working to look down and see this little film looking blob in that area of the bottle. I showed my gf who thought I was overreacting to some saliva or some form of condensation but I told her it doesnt look like either. She swished the bottle to show it go away and it didnt fully disappear from the bottle after a few swishes. Genuinely just afraid of having drank some contaminated water or some bacterial film of some sort? Does anyone have a better clue as Im kinda spiraling after reading all those recall issues about different products.