Watermelon and green apples, with a little Ice.
The Iced Chocolate or Coffee are not really that good for summer's Hot Hot days.
They look nice, and sound great.....but it is milk, and is not a thirst quencher at all.I would stay away for the great part of any milk,during really Hot days.
Water and lemon are rather good, but also try fresh fruit juices....I know it is boring, but water is your real winner.Mainly because our body is a great deal of water it's self, so your giving it what it not only wants, but needs!