My favorite thing to do is to cook a pork roast, then use the broth and bits of pork to make the soup. The best part is that you don't even have to wash the crock!!
You can also use vegetable stock or chicken stock, if you don't have fresh pork broth. Use more broth of you like it soupy, less broth if not.
1 cup dry navy beans
6-8 cups pork broth, chicken broth or veggie broth
1 carrot, diced
1 celery stalk, finely diced
Small hunk of onion finely minced
1/2 tsp garlic powder
1 tsp salt
1 tsp black pepper
2 bay leaves
Put everything in the crock pot and cook on low 8 hours or high 6 hours, until beans are done.
Taste and add more salt and pepper as necessary.