1) assign live info to any bubble

2) add standard watch face complication

1) Live Info

You can assign “ live info ” to the apps on your watch face. Instead of the standard “calendar” icon, your calendar app bubble can show the current date :

Long press the bubble which you would like to show the date (instead of its icon). Then scroll up on the Bubble Edit screen to the “Assign Live info” section, and select the date live info.

Press the hardware button to go back to the watch face. Tapping on the icon will still open the app, but instead of its icon, you will see the date (and day).

You can assign the battery level to a different bubble in the same manner:

If you use the phone app, the same can be achieved if you press the (+i) button in the Wear Cloud Editor next to the bubble:

I recommend doing it from the Wear Cloud editor, because there are a lot more options there: