Excellent idea!I cut a naval orange in two, make a hole in the rind close to the cut egde. Then with an old sandwich bag twist tie, or sometimes I use a zip tie, I fasten the half orange to the side of the box so it has the cut side towards the middle of the box. That way, they can eat the fruit, get sugar liquid as well, and they are not walking in the fruit either or is the juice wetting the bedding. I've had very good luck doing this. Sometimes, with large fowl, I'll also put some whole wheat bread slices in as something extra.
I personally don't like to put water in the box, as its been my experience getting chicks that had water, the water spills, and wets the shavings. Its a risk that the birds get wet & chilled.
Too cute!!