主题：实在看不下去了，冒个泡 -- 老科学的家

"The [bottled water] industry grossed a total of $11.8 billion on those 9.7 billion gallons in 2012, making bottled water about $1.22/gallon nationwide and 300x the cost of a gallon of tap water," Colas says. "If we take into account the fact that almost 2/3 of all bottled water sales are single 16.9oz (500 mL) bottles, though, this cost is much, much higher: about $7.50 per gallon, according to the American Water Works Association. That’s almost 2,000x the cost of a gallon of tap water and twice the cost of a gallon of regular gasoline."