before bed we put have the boiled water in the bottle, let it cool and put in fridge. Then in the night whilst i change LO's bum Oh comes downstairs, boils the kettle, pours in a premeasured amount of powder (from the powder dispenser things), mixes up to the right amount with freshly boiled water and hey presto the perfect drinking temp in 3 mins flat!
I'm really lucky OH gets up!