I don't anymore, but what I used to do was boil the kettle, and make up enough bottles for the whole day (minus the formula). So I'd have, say, 6 bottles with the right amount of cooled, boiled water in them. They don't need to go in the fridge if it's just water, so I'd keep them in the cupboard. When it came time to use them, I'd just add the formula - they were room temp, so didn't need to faff about with kettles (if it was cold, I would just stand it in hot water for a minute).
HTH