I personally believe that a user pays system (i.e. individual meters) will end up serving you better in the long run. Individual meters have their advantages, particularly when you use tank water in addition to mains water. There is no incentive to save water if there is only one main meter and the water bills are divided according to unit entitlement (UE). Those tanks will empty quickly if no one is concerned about water saving. Under the UE system a single person in a 3brm apartment ends up paying the same as 7 people living in the same sized unit when clearly the water usage is much less. Also, it is difficult to track down leaks in the water network if there is only one main meter. If a tap is leaking then an owner may think that it is not worth caring about as they are only paying for every fourteenth drop!
As for your current problem with gaining access to a copy of the bulk bill …keep trying via the developer owner. You cannot be expected to pay a bill which you cannot see proof of. Document all your attempts to resolve the issue. And seek assistance from the Office of Fair Trading from someone who is familiar with problems in strata in the initial stages.
When are the individual meters being installed?