You can download it to the Fenix 6. But it’s buggy.
Mine worked for a day or so. Now it won’t sync my hydration data with Garmin connect and shows a small red ! at the top of the screen when trying to use the widget.
My observation is, that it's only working properly if the watch is connected to the phone.
As soon as the watch is disconnected, for example you go to the kitchen and you don't bring your phone, even if you can add more water it will be out of sync from that point.
It does not re-sync after the connection re-established and doesn't use the wifi either, so pretty much there is not much sense using it because if you bring your phone you can use the GC app, it's more reliable.
