Place 5 eggs, plus or minus 1, in a water bottle cap for placement into the caterpillar cup. Carolina recommends placing the eggs on wax paper to avoid the eggs touching the food. A cap was used instead with the idea in mind that it would prevent the egg from getting wet and at the same time prevent the egg from rolling while the students take the cup home. An alternative is to use a small plastic centrifuge tube like the one that the eggs were shipped in and embedded that into the food