Do not add water. Ready to feed in a convenient package. 1st Choice of doctors. For common feeding problems such as fussiness, gas and spit-up. Milk free. Lactose free. Breast milk is recommended. If you feed formula, you can turn to Isomil with confidence. Shown through research to be well tolerated. Provides calcium for your baby's growing bones. Supports good growth similar to that of infants fed breast milk or Similac with Iron. Trusted nutrition for more than 30 years. Filled by volume to 1 quart. Extra space in bottle allows for shaking and easy pouring.