The bacterium Bordetella pertussis is the primary whooping cough cause. There are no other causes, and the infection follows no distinct seasonal pattern. People may become infected with the bacteria by breathing in tiny droplets released into the air by an infected person's cough or sneeze.
There are approximately 1,892.7 milliliters in 1 half-gallon of volume. That works out to 3,785.4 milliliters per gallon, 1.892 liters per half-gallon and 3.785 liters per gallon.
So, if you have 8 16.9 oz water bottles, you have a gallon, plus 7.2 extra ounces, just less than a cup. Now why do you see bottles with a weird quantity, like 16.9 ounces? 16.9 ounces is half a liter.