The most common is 600ml bottled mineral water, two liters of water and three bottles (3 and 1/3 bottles).

Bottles are big and small.

The big one has two liters of bottled mineral water (for example, we have Yi Gang Run House), and two liters of water is exactly 1 bottle.

The small one has 250 ml bottled mineral water (such as Mixian Spring), and two liters of water are exactly eight bottles.