Mine always had room temp bottles. No one told me I had to warm it, so never did!

Before going to bed, I used to wash, sterilise and fill up the bottles for the next day using boiled water from the kettle. I would also portion out the formula for each feed into one of those formula transport thingy's. The water would cool overnight and was ready to use the next day.

That way it was easier when going out to chuck bottle with water and portioned formula into the bag and ready to go!