5. Watermelon cooler. Summer just can’t exist without watermelons! This fruit is rich in vitamin A that is important for growth and development, maintenance of your immune system and vision. Other ingredients of this cooler are rich in vitamin C. The recipe is really simple: take 2 cups watermelon, 1 peeled pineapple, 1 peeled orange, and half of peeled lime. Mix all the ingredients in a blender. Cool your drink in the fridge.