Boil fresh water. Cool for at least 30 minutes until lukewarm. Make a few bottles of water so you don’t run out. Store sterilised, sealed bottles in the fridge.
Check instructions on formula tin for how much water to use. Put this amount of cooled, boiled water in a sterilised baby bottle.
Check instructions on formula tin for how many scoops of formula to use. Tap scoop, and level it with a flat blade. Add formula powder to cooled, boiled water in bottle.