Chicken bouillon would not be recommended for a juice fast, not only because it is meat-protein, but also because it probably has lots of extra salt! This could actually cause a headache during a fast!
Stick to fresh fruit juices in the morning, and fresh vegetable juices in the afternoon, plus lots of extra water! The herbal teas are fine, as is fresh lemon juice in your water. Add cayenne to your vegetable juice for extra cleansing.
You need to keep your intestines squeaky clean every day of your fast... I just outlined the methods in the post or First Juice Fast above. In your case I would highly recommend an enema--this has relieved many a toxic crisis instantly for me!
Let's drink to your health!