Place bacon and onion in a large, deep skillet. Cook over medium-high heat until bacon is evenly brown and onions are soft. Drain off excess grease.
Transfer the bacon and onion to a slow cooker, and stir in chicken broth, water, potatoes, salt, dill weed, and white pepper. Cover, and cook on Low 6 to 7 hours, stirring occasionally.
In a small bowl, whisk together the flour and half-and-half. Stir into the soup along with the evaporated milk. Cover, and cook another 30 minutes before serving.
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