We cool boiled water in a jug (in our case a Pyrex glass one) then put this in a sterile water water (just a freebie one from Brita) which we use to make up his bottles. When ds wants warmer water for his milk, we have water in the kettle that has been boiled and just turn the kettle on for a few seconds (about 10-15 seconds) to warm it then use this to make his bottles.
I know it's not specifically suggested, but it was our coping method and worked for us.
Now that ds is older, we just make sure that we have a Thermos of warm water when we go out. That way he can have either warm milk, or warm food effectively on tap.