I have 5 bottles for milk, I fill them with boiled water and pop them in the fridge, when needed I microwave the water, for 50 secs add the formula and it's perfect temp. I used to make the bottles up but then it took longer to heat and bubs didn't like the wait!!!

I never microwave milk, it's not good for the bubs. When i travel I take 2 bottles filling them with boiling water, by the time feeding comes it's cool enough for monster to drink!