You can try the Tuya Neo driver, it works OK with the ThirdReality 3RWS18BZ water sensor and shows activity every hour:
The battery level is not reported automatically. I will check whether it is not possible to poll for the battery level once every 12 hours, for example.
ThirdReality 3RWS18BZ also responds to ping commands (reading a standard attribute), which means there is one more way to actively check whether it is dead or alive.
