Advice please on mixing formula

[familygirl30]

It says to boil water and leave in the kettle at least 30 mins,so can u not prepare feeds ready,I'm confused!

 

[Bonnie11]

I just put couple oz boiling water in. Then powder and mix. Then top up with cool boiled water. Just boil a kettle in the morning and pour into a jug and leave on side as your cool boiled water.
If you do it exact from the guidelines baby will be waiting long time for their food!