Place meat in slow cooker; add water and bouillon. Season with garlic powder, salt & pepper. Cook on "HIGH" 4-6 hrs or til meat is very tender. Remove meat; set aside to cool slightly. Discard liquid.
Shred meat with fingers, discarding any fat or bones. Return meat to slow cooker. Add remaining ingredients and stir well. Cook on "HIGH" for another 30-60 minutes longer. (If left unattended longer than 1 hr, set temperature to "LOW".)
Stir well again and serve on whole wheat kaiser rolls.