The cordial seemed to do the trick, as Jeremy came home with an almost empty drink bottle! We will try it again next week, and hopefully he will keep up his drinking.
This week, about half of the food that he brings to school is still in his lunch bag at the end of the day. He claims that he is too "full" to eat - but speaking to the other kindy mums, this appears to be common as the kindy kids are too excited and too busy to sit down and eat. It may also be rather hot outside in the playground for him to feel like eating, and at the moment we are not concerned because he is eating OK at breakfast, afternoon tea and dinner.