A child's fluid need climbs sharply during exercise, and the stone plan's goal is the same as the adult version: keep urine dilute, not dark. The measured rule is a bottle before practice, a refill at every water break, and a full glass after the whistle. Sports drinks earn their place only during long, sweaty sessions — for a typical hour-long practice, plain water is the better default, because the sugar in the sports drink works against the hydration it provides.
The snack table after the game is the second place the plan gets tested. The measured version keeps the calcium and the water, and portions the sugar and salt.
| Food | Oxalate (mg) | Serving | Rating |
|---|---|---|---|
| Watermelon | 2 | 1 cup cubed | Safe |
| Orange, fresh | 14 | 1 medium | Safe |
| Apple, fresh | 2 | 1 medium | Safe |
| Banana | 6 | 1 medium | Safe |
| Yogurt, plain whole-milk | 5 | 6 oz | Safe |
| Cheese stick | 1 | 1 oz | Safe |
| Pretzels | 1 | 1 serving | Safe |
| Sports drink (Gatorade) | 0 | 12 fl oz | Safe |
The fruit and dairy deliver the post-game calcium and potassium, and every item sits in the Safe zone. The sports drink's oxalate is zero, but its sugar is the separate concern — fine for a long tournament day, unnecessary after an hour of practice.
Put the plan in the bag, not in the child's memory. A labeled water bottle with a known size, a refill reminder tied to the breaks, and a piece of fruit or a cheese stick packed for the ride home. The parent on the sideline is the one who makes the water visible and drinkable — the child's job is just to run.
A Saturday tournament is a different animal from a weekday practice — four or five games, hours between them, and a snack table that never really clears. The measured rule scales up with the hours: a full bottle at the start of each game, a refill at halftime, and a real lunch in the gap between games rather than grazing the table. On a long tournament day the sports drink finally earns its place, because the sugar also supplies energy — but it still should not crowd out plain water. The parent's job is the running refill: a cooler of water in the car, fruit and cheese for the between-game gaps, and the pale-urine check when the day finally ends.
See how oxalate values are measured and verified on our data methodology page.