~죠 would be the same as ~지요, right?
a little bit? because you'll text your friend ~죠? but not your boss of course
Yes, I would say so.
Correct, 죠 is more colloquial
Do I have to add 물이 here?
What is the difference between -지요, -죠 and -잖아요?
지요 and 죠 mean the same.
지요/죠 : https://www.howtostudykorean.com/upper-intermediate-korean-grammar/unit-4-lessons-92-100/lesson-93/
잖아요 : https://www.howtostudykorean.com/upper-intermediate-korean-grammar/unit-4-lessons-84-91/lesson-90/
강이 깊진 않죠? could also be a good sentence to use.