The metric unit of volume is the liter.
1 cubic meter = 1,000 liters
A liter looks a lot like a quart. It's only about 6% bigger than a quart.
The larger-style water bottle that you might buy at the Sebm Lebm store
and carry with you when you're walking is 16.9 ounces ... that's 1/2 liter.
Those big heavy plastic soda bottles that hang around in the fridge
for several days are 2-liter bottles.