What do you have there for drinking water? Do you have well water? I guess
since you are in Sydney, you are on city water. Maybe you can fill a few jugs
now in case the start limiting.
We've got great quality tap water - some say it is the best in the world, and I won't argue with them.
There are 15 dams supplying Sydney, but the problem is the dams have to be able to hold enough water to go more than 10 years without significant rain to replenish them. Very few cities in the world need that amount of water stored. We have also built a desalination plant since the last drought just-in-case.
Australia actually has the most water stored per person in the world, but we are also the driest continent in the world.
The Millennium Drought was a wake-up call though. My landlord fitted water-saving faucets & shower heads to all apartments, and I have a dual-flush toilet to cut water usage.
Though I did have a go at the gardeners of my building recently for planting non-native plants that need frequent watering. Told them to plant local species that can last for months without watering. Some people just have no idea...