Where is watch water lock since 10.0.1 update?

Hi Tiarella123

Water Lock can be found in Control Center, which as of watchOS 10, can be opened by pressing the side button of the Apple Watch. Note that the side button is not the Digital Crown; it is next to the Digital Crown.

To unlock after enabling Water Lock, press and hold the Digital Crown.

Hope this helps!

Use the Control Center to use the "water lock" icon.

"To open Control Center, press the side button (for watchOS 9 or earlier, touch and hold the bottom of the screen, then swipe up). You can open Control Center from any screen."