Hi there, I've always boiled water for at leas...

Hi there, I've always boiled water for at least five minutes to make up my son's formula. My baby boy is now 8 months old so I was wondering whether I could just use boiled water straight from a kettle. I've also put his drinking cup in boiling water for five minutes before filling it with boiled water. If anyone has any advice I would appreciate it. If I can get away with using kettle boiled water it would save time.