Juice is an element in Candycrush071's Candy Crush. It's different than soda in Candy Crush Soda Saga in many ways. First of all, it doesn't make candies flow in the opposite direction, they will still flow in the same direction. Second of all, it cannot pass through all the blockers like soda can. It can pass through some of them (straw locks, bubblegum, sugar chests, licorice swirls, regular icing, toffee tornadoes, cupcakes, tarts) but cannot pass through others (multilayered icing, cake bombs, licorice locks, marmalade, popcorn, licorice links, chocolate, ice), and also it cannot pass diagonally or through portals like candies can. Also, as long as the access is free (no blockers that restricts passage or removed tiles on the way), it will fill the entire row (or column if the board flows to the left or right, like in Level 891). It's main function is to allow more types of special candies to be formed with matches.
Matches comparison table
(left is before and right is after)