Answer:
1 liter of milk in the US.
2 pints of milk in the UK.
Explanation:
1 liter = 1.76 UK pints.
So 2 pints of milk is the best buy if you are in the UK.
In the US:
1 liter = 2.11 pints
So 1 liter is the best buy in the US.
I'm guessing you're from the UK because you spell litre this way.