Welcome to the Forums and beautiful Daytona grey colour choice! 😁
I’ve not heard of water in the sills, as unless you have a sunroof, the water can channel down there but there’s usually a drain port.
From pictures I see you don’t have this feature so I’m going to break some potentially bad news here.
Please see this link to see whether it’s similar symptoms...
So either faulty fuel tank or adblue tank empty... hopefully the latter!
THIS IS WHAT I HAVE FOUND ON AN OTHER FORUM