This is a fairly involved process as it seems that no one currently makes a pre-made product that measures water usage from a household meter.
It took quite a while to set up due to WiFi issues and the flow rate code still needs some work as the output is semi-random at the moment.
If you get stuck anywhere I'm happy to answer questions provided this doesn't go viral 😂
- DFRobot Beetle ESP32 microcontroller (https://www.littlebird.com.au/products/beetle-esp32-microcontroller)
- Water meter pulse probe for the specific meter model (https://www.aquatrip.com.au/accessories is one of the only places I've found that sells them)