thanks for the huge responces! I'll definately try and give this a go then, im just worried it won't last long! Due to work etc I would have to make all Juices the night before. So Canning Jars are the things to use - im from the UK but hopefully i'll be able to find some online. And juice must be filled right up to the top so there is no air - can I fill any remianing gap with water if i don't have enough juice?
Like someone else mentioned.. unless pratically everyone of the Juices is with Fruit, even then I can't see myself getting 2000 calories even with a gallon... Like i said, I will give it a go, up the Superfood, and see what happens!