Some small towns like Bundanoon [1] have banned water bottles, but in no way have water bottles been banned across NSW.

There has been a push from leading supermarkets Coles and Woolworths to ban single use plastic bags, with great success. But that's a private matter, not from the government. Other states have banned them, but not NSW. [2]

[1] https://www.theaustralian.com.au/news/nation/bundanoon-in-wo...

[2] https://www.abc.net.au/news/2018-12-03/supermarket-ban-sees-...