In a slow cooker, stir together water, wine, soy sauce, onion flakes, beef bouillon and onion powder.

Roll the tenderloin around in the slow cooker coating it with the wine mixture.

Spread the garlic over the top of the tenderloin, sprinkle with pepper.

Cover and cook for 4 hours on high.

Let sit for 5 minutes before serving. Serve with the liquid that the tenderloin was cooked in.