In my on-going quest to find milk (any milk) that Z (now weaned....well almost) will drink (scratch cows, goats and soy) I've hit on a product that is completely useless for a one year old but might be fun for the older set.
It's a Sipahh Milk flavouring Straw, available in chocolate, strawberry, banana, caramel, cookies & cream, chocolate-mint, and toffee apple flavours.
Here's how the Sipahh works. Simply place the straw in a glass of plain milk and the flavour is released. The producer, Unistraw from Australia, says the flavouring equals just 1/2 a teaspoon of sugar to the drink.
I'll let you evaluate the Sipahh straw's merits for yourself (it's pretty obvious this doesn't exactly fit into the healthy eating part of Gastrokid). Could be just the gimmick you need though to placate that feisty four year old.