One of the three zero sugar flavours. This one tastes the best IMO.
This is as cheap as it gets according to Camel 3x. Works out at $1.64 per bottle with sub and save. Currently half price at Coles until tomorrow but 20c per bottle cheaper here.
Other non-zero flavours available slightly cheaper.
I use this when water just won't cut it but it doesn't kick me out of ketosis.
10c per bottle refund in participating states.