@LazySue You cannot edit on Versa. On the tracker you can only add. To edit the logs you need to open Fitbit mobile app, tap on the water tile and edit there.
@LazySue It could happen if the amount was entered by accident either on your Versa or in the Fitbit mobile app. Just in case, keep an eye on it and if it happens again please take a picture and post here. Thx!