Here are some substitutes for "for crying out loud":
* For goodness sake!
* For Pete's sake!
* Oh, come on!
* Good grief!
* Seriously?
* Are you kidding me?
* What in the world?
* My goodness!
The best substitute will depend on the context and the speaker's desired tone.
It's important to note: The phrase "for crying in soup" is not a real expression. It is likely a mishearing or misunderstanding of "for crying out loud".