Is there a rule against littering water bottles on the course ? I keep seing them littering all the time in places that there are nobody to get those bottles.
no
i believe most tours employ people to come pick up after the them
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I don’t think there is a unversal rule. Certainly CA has a law about it. I suspect being pulled over by a cop would have an effect on the GC ;-). In the big tours (TdF, Giro, etc) I suspect they get picked up by fans pretty quickly. For smaller ones my guess is the race organizer is responible for venue clean up.
Styrrell
They can throw stuff wherever they want. There are supposed to be volunteers out picking stuff up but from my experience the volunteers are probably lucky to get half the stuff. I rode the ToC course stage 1 immediately before and after the event and there was a significant amount of Clif Bar and GU trash still out there. The volunteers focus on the feed zones but the riders are throwing stuff constantly.