In NSW, if tap water is supplied, then it must be:
"free or nominally priced to reflect any minor costs associated with the service."
If the venue does not offer tap water, then bottled water must be
reasonably priced. A reasonable price for drinking water is:
a) where drinking water is sold on the premises in a pre-packaged
form, less than the lowest price at which an alcoholic drink is sold
on the premises; and
b) in any other circumstances, a nominal price.
The above information, and much more on the topic, can be found at the
NSW Department of Gaming and Racing website:
FREE OR REASONABLY PRICED DRINKING WATER COMPULSORY IN LICENSED VENUES
As a regular patron of Australian bars and nightclubs, my
understanding has always been that if they have the capability to
serve you tap water from the bar, then they should. Nightclubs
sometimes only serve bottled drinks, so in that case they can charge
you for water.
WA has a similar policy to NSW:
And in SA:
"I am advised that licensed premises are not required by law to offer
free water to customers when serving alcohol. However, the practice of
offering free tap water is very common in most pubs and clubs and is
strongly encouraged by the Liquor and Gambling Commissioner as part of
a responsible service involving the supply of alcohol."
site:au water nightclubs available
site:.au pubs "free water"