I don't know... putting nothing but bottled, dead juices and water into my body scares me... I think I'd rather do a water fast. A friend of mine did that and she not only did not lose weight as one would on a raw juice fast, she constipated herself so badly, she was worse than when she began.
Bottled juices are not only dead, but contain additives and so much sugar. I know you know this, but I just had to point it out.
You're going to need some live raw greens to help you through an extended fast. My daughter, five years ago, couldn't afford an expensive juicer, so she splurged on a $79 Hamilton Beach job as a start... just to have something to juice the produce until she could get something better. It worked out really well.
I really suggest you juice fast with raw live juices to truly receive the incredible, glowing, gorgeous benefits of a live raw juice fast. You will never receive those benefits drinking dead, bottled, store bought juices.
I'm sorry, but it's the truth.
I hope I've not discouraged you as that is not my intention. I want you to experience the beauty of a raw live juice fast, but you have to drink raw live juices for that to happen.