>Claiming you could drink a quarter of it implies you believe it is food grade.
This makes no sense. Chemicals aren't inherently food grade or not. I won't drink a non-food-grade quart of water either.
>It's extreme my disingenuous to hypothesize that a Roundup bottle imparts more health hazard than the contents.
You've heard of agent orange, right? It wasn't the herbicides that injured people, it was small quantities of potent contaminants.
It's not just the bottle, it's every container it's ever touched, every source for dirt or bad-to-ingest chemicals to get in that wouldn't bother plants at all.
Edit: And to be clear, this applies just fine to things that are human-safe in small doses or for farm use. Contamination by literal dirt is a great example of something fine to spray on plants and dumb to consume directly.