Examples:

• When John started gambling, he didn't realize he was getting into deep water. Now he owes a lot of money to some dangerous people.
• If you don't study for your exams, you'll quickly get into deep water and struggle to catch up.
• The company got into deep water when they were caught cheating on their taxes. They had to pay a huge fine and lost a lot of their customers' trust.
• Mary thought she could handle the new job, but after a few weeks, she realized she was getting into deep water. She didn't have the skills or experience necessary to succeed.
• If you keep lying to your friends and family, you'll eventually get into deep water and lose their trust. It's better to be honest from the beginning.
• I'd get into deep water if i tried to imitate him.