The fair's stone risk is the hours on the feet with the water bottle somewhere under the table. The measured rule is the same as every long day: a bottle at the display, a refill at each break, and water as the drink at lunch rather than soda or juice. The student who is presenting and answering questions all afternoon is the one who forgets to drink — which is exactly why the bottle has to sit in sight on the table, not in the bag.
The fair's snack table and lunch options run on familiar items, most of them low-oxalate:
| Food | Oxalate (mg) | Serving | Rating |
|---|---|---|---|
| Apple, fresh | 2 | 1 medium | Safe |
| Banana | 6 | 1 medium | Safe |
| Cheese stick | 1 | 1 oz | Safe |
| Yogurt, plain whole-milk | 5 | 6 oz | Safe |
| Pretzels | 1 | 1 serving | Safe |
| Potato chips | 18 | 1 oz | Safe |
The fruit, dairy, and pretzels all land Safe. The chips are safe on oxalate but carry sodium, so they are the one item to keep modest. The dairy doubles as the calcium anchor that pairs with whatever the lunch turns out to be.
Pack the fair bag the night before: a full water bottle, a fruit and cheese snack, and a low-sodium lunch if one is not provided. The goal is not a perfect day — it is keeping the water visible and drinkable through the hours on the feet, so the student ends the fair with pale urine instead of a concentrated afternoon.
The fair's first test is not the afternoon — it is the morning rush, when the display gets set up and the water bottle gets left on the kitchen counter. The measured fix is a morning routine that packs the water with the display board: a full bottle, a fruit and cheese snack, and a glass of water with breakfast before the day starts. The student who walks in hydrated and carrying a full bottle has already won the day's water battle before the first judge arrives, and the afternoon becomes maintenance instead of catch-up.
See how oxalate values are measured and verified on our data methodology page.