installed the widget, it looks like following Screenshot:
this one is wrong, or, but not sure?
in Connect IQ Store it looks different:

and the thing of my second screenshot, where i am able to scroll true the cups, there i have the option for:
- 250 ml
+ 250 ml
+100 ml
+250 ml
+500 ml
that means, i am missing:
- 500 ml
- 100 ml
and +250 ml is 2 times!
anyway, in Connect IQ it's possible to set reminders!
Don‘t think it’s wrong. Looks little strange but behaves as you‘d suspect.
You can set up 3 container sizes via GCM or the widget option on the 945 on whatever size you want them to be.
And I‘d say +/- 250 ml are default on top and you can’t change them. This seems to be for quick calculations and errors.
The sample pic showes a Venu/VA4. Those are touch enabled, they have a different UI.
+-250 on top are fixed amounts and not containers. I think there is no - for containers/cups.
The next three cups can be customized to your typical amounts.
Auto target in the Settings adds estimated sweat loss to your drinking target.
In my experience, it works better if you wait a few seconds after adding a cup on the watch. If you go back to fast, it won't even add it in the watch, so it can't be synced to the app because its not "counted".
This widget itself still needs a lot of work. But: you can reach out to the developer via the AppStore, even if they are not answering.
it worked 2 days for me and i am not sure, but it could be possible that my strange bug i posted in Sensor Hub Thread have something to do with the Hydration Widget, because it needs alsways an open BLT connection to the phone:
writing to a developer?
i tried several times, but without feedback of them, it makes no sense?