I just tested it. There is something weird going on with these water bottles.
Turnbased mode:
1. When using the shortcut (directly clicking on the bottle) a throwing arc appears and the action point is used up immediately. I am now unable to throw the bottle.
2. When using the throw icon and selecting the water bottle, a throwing arc appears and I can throw the bottle - but then I can click on the water bottle shortcut directly and throw -another- bottle in the same turn.
In summary,
Using the shortcut: Not able to throw a single water bottle.
Using throw icon and then the shortcut: Throw two water bottles in one turn.
