The number of ounces in a bottle of water depends on its size, as water bottles come in various capacities. Here are some common sizes:
8 oz (small)
12 oz (standard soda can size)
16.9 oz (500 mL, common single-serve bottle)
20 oz (larger single-serve bottle)
33.8 oz (1 liter)
128 oz (1 gallon).
