The NFL football field, including end zones measures 360 X 160 Feet.
The 2L soda bottle diameter is slightly different according to source, one of which gives the circumference as 31 cm, hence a diameter of 9,8676 cm = 3.87 inches.
Several other sources give a diameter of 4 inches.
To be conservative, I will use 4” as the diameter of a 2L soda bottle.
Across the width of the field you can fit 160(12)/4 = 480 bottles
Along the length of the field you can fit 360(12)/4 = 1080 bottles
Therefore, field can hold 480 X 1080 = 518,400 bottles.