As an alternative to eggplant, I suggest you wrap the canteloupe with something leafy. Perhaps spinach. I think mint would go fabulously with melon as well, but you wouldn't want to wrap with the entire leaf, just add a little chopped mint.

I second the grapertiser suggestions. I've recently become a big fan of soda as well. Mix it up with a dash of fruit juice, or maybe add some pureed berries or something. You may need to experiment. For a less sugary version of lemon lime and bitters, I mix half a shot each of lemon and lime cordials, bitters, top up the rest with soda water, and stir.