I tried her with milk in her tum tum cup, cold, yesterday with her lunch, and she drank it all. I was actually really surprised. She's been on a morning and an evening bottle for the last few weeks, so we're going to try the tum tum for morning from tomorrow and then if she's good with it do the night one and the gradually just go from milk for a meal to milk as a drink with a meal.
I gave him the sippy cup during the day at meal times with water in and then started with morning milk in the sippy cup for a week before giving him it at night, too