Crockpot Pork Tenderloin Cook

How do I cook a pork tenderloin in a crockpot?
I've never done one of these before, but my boyfriend wants. the recipes I can find what you need to use vegetables and tomato juice etc. etc. It is already flavored, so I just need to know what to do. This is one nets, 1.22 lbs. How much water do I need and how long do I set the timer for? Do I put the temp on low, high, or warm? Thank you:)
If it is already seasoned / marinated, place it in your slow cooker and pour about a cup of water around him. Cook over low heat for about eight hours and released perfectly. If desired, peel potatoes and add to crock around the pork when you start it. They pick up the flavors of pork and be absolutely delicious!
Betty’s Crock Pot Pork Roast Tenderloin and Gravy Recipe