Where is a water bottle not allowed on a golf course?
Well, your first answer may be because the course restricts "outside beverages" to be brought in as many of them do nowadays to promote more on-course beverage sales.
[toggle title_open=”Hide Answer” title_closed=”Show Answer” hide=”yes” border=”yes” style=”default”]
What may seem as an innocent action can actually turn into a penalty. Believe it or not but you can't place a water bottle (or anything deemed to be a bottled drink) on the green. Someone could say that you are using it as a level.
Decision 14-3/12.5 Bottled Drink Used as a Level
Q. A player places a bottled drink on the putting green in order to gauge the slope of the green. Is the player in breach of Rule 14-3?
A. Yes. The player is using equipment in an unusual manner to assist him in his play contrary to Rule 14-3 (artificial device).
Now this is not a golf rule per say but it is a golf decision, meaning that such a situation did come up at one time and it took the golf's governing bodies to make an "interpretation" of Rule 14-3 in what a reasonable person would say in such a situation.
So if you have a water bottle in hand on the green, be sure to toss it aside to the greenside rough!
[/toggle]