For Level 2 it is up to you how much of your food or smoothies you will replace with juices.
You can do just one or all!
If you go extreme you can do an entire day or even multiple days of just juice.
You don't have to use the berries for your juice - ANY produce is fine, but be sure to make juices that have veggie juice in them and not just fruit!
Put as much veggies into juice as you can and only as much fruit juice as is needed to make it palatable to you.