Wash, prep, and dice your child's favorite fruits. 2 cups diced fruit is the equivalent of 4 large strawberries, 1 medium orange, 1 medium apple or nectarine, for example.
Fill each lidded container about ¾ full with fruit. Pour and divide the lemonade inside all 4 cups. You don't need to fill each cup to the top to cover the fruit.
Close the lid, and give it the contents a quick shake to coat all the fruit with the lemonade. The citric acid in the lemonade helps slow down the oxidation (browning) process.