Great for the entire family! Not sterile. Use as directed by a physician or by labeling directions for use of infant formula. This product is not a nutrient or electrolyte replacement. NSWA (Natural Spring Water Association): Certified Spring Water. When Gerber decided to provide water for babies, we looked for the purest natural spring we could find and one of the most advanced purification processes available. Our crystal clear spring water has traveled through the Appalachian Mountains and is bottled using a multi-step purification process which includes micro-filtration, ozonation and U.V. light. Great for preparing infant formula; Mixing with cereal; On the go.