Keep sterile bottles in a sealed container in the refrigerator. If you want to ensure that the bottles aren't exposed to any germs or bacteria, you can store them in a sealed container, such as a plastic or glass food storage container, in the refrigerator.
Hot, soapy water is sufficient for sanitizing a bottle, and sterilizing baby bottles on a regular basis isn't necessary. If you opt to let the dishwasher clean your baby bottles, make sure each piece —caps, nipples, sealing rings, valves — are thoroughly rinsed under running water before being loaded.