Synching between iPhone and Watch is a gamble; sometimes it does synch, but most of the time it does not.
Even if there is synchronization between the devices, the app may randomly reset the daily the consumed amount to zero.
Despite repeatedly resetting the measured amount to milliliters on the iPhone app, the Watch will restrict adding consumption amounts to only ounces.
I can only hope for either an update that will prompt me to update my review by praising the app or an alternative app that performs as this app once did.
Balzac about Waterbalance