Cow's Milk - Night Feeds

My son has just moved on to cow's milk, but he still has a bottle during the night. How are we all managing this?! Just running downstairs to make the bottle or somehow keeping it upstairs? He was previously on a prescription formula that you just added to room temp water, so I never needed to think about it. (I know milk in the night isn't ideal - but unfortunately he's just not ready to give it up yet).