I get mine from my local water companies website - Sydney Water. I actually think they have to be available at all times due to legislative requirements
Kevo,
You should look for level of Bicarbonates or total alkalinity, ph, calcium and sulfate levels. Gold coast water is pretty good from memory. I think it's quite soft (low carbonate) so all you would have to do is adjust is the Ph and possibly add some calcium. The water report is generally on the council websites. Water treatment involves a fair bit of reading before you start messing with it so best do some research.