Amazing Grass suggests that only one big scoop of powder be added either with 8 ounces of water or juice or to a smoothie. To save calories, you may be better off mixing them with water. If you are on a strict diet plan to shred some fat, then it is better if you consume it with water. Alternatively, may also mix it with a low-calorie smoothie, which can also help you get more fruits and vegetables included in your diet.