Firstly, open the lid. Each cup has a recommended fill line indicated by an arrow on the cup. For a thicker smoothie, fill to the line. For a thinner consistency, fill above the line. You can use any liquid of choice for our cups. We recommend room-temperature water for the most optimal blends, with the only exception being olive oil for our Kale Basil Pesto cup. For smoothies, you can also use dairy-free milk, juices, or plant waters like coconut water. For soups, you can try using broth or coconut milk to add some flair.