D.W.
Hi H.,
I know exactly where you are coming from. I am a Pedi RN and a mom of 4.
I am the really mean mom---- personally, I recommend just throwing the bottle away. Period. It takes approx. 3 days to break any habit, so be prepared to hear about it for that long. When it is time to drink offer her a cup and say, here this is whay you use now". End of discussion. We have a "Fit rug" where my kids can go and scream all they want. When they throw a fit they are sent (or placed) there. All it is is a small carpet sample square from the dollar store, but it works great.
Don't forget, you are the mom and you get to call the shots :-)
All the best,
D.