Once you know how much water is needed for the type and size of bottles you use you just pour it into the chamber and turn the device on. (babygearhub.net)
Obviously if you choose to store your milk in bottles they will need to be either the same brand or a compatible thread size as your breast pump. (breastfeeding-babies.com)
Check out the variety of water bottles we keep at our desks and in our gym bags, and consider choosing one for yourself. (health.com)