Soda Water

 Regulator
Thread is type 30
Kegland.com.au

keg-king.com.au    $45 "MKIII Regulator for CO2"

Bottle
6kg
Only ships with 4kg
Kegking.com.au    $104

Hose
$5 plus clips
From Country Brewer

Refills
Country Brewer
Drop off and leave it because they have to chill the bottle 

Softdrink Bottle top
~$12 on ebay

Hose bit
~$20 ebay