Răspuns :

How much water have you drunk ? "How much" se foloseste doar in cazul substantivelor nenumarabile. 
How many glasses of water have you drunk ? "How many" se foloseste doar in cazul substantivelor numarabile. 
We have a few oranges . "A few" se foloseste in cazul substantivelor numarabile. 
There is little coffe left. "A little" se foloseste in cazul substantivelor nenumarabile.