Step 1: Simply add freshly boiled water into the RapidCool™, using the measuring graduations inside the RapidCool™. Step 2: Next, add your pre-measured formula powder to the freshly boiled water, in the RapidCool™. Step 3: Then give the RapidCool™ a good shake to mix your formula and water together. Step 4: Tip the RapidCool™ upside down for the feed to contact the thermometer. When 'Nuby' changes to green your feed has cooled. Step 5: Pour your feed into a sterilised bottle, and you are ready to serve - in as little as 2 minutes!  Step 6:Clean the RapidCool™ after each use with UV, cold water or steam sterilisation. The digital lid can be sterilised with cold water or UV