Правило такое:
с неисчисляемыми существительными используем "a little",
а с исчисляемыми существительными — "a few":
1. a little lemonade
2. a few men
3. a little milk
4. a few sweets
5. a few women
6. a few houses
7. a little money
8. a few friends
9. a little snow
A little lemonade
A few men
A little milk
A few sweets
A few women
A few houses
A little money
A few friends
A little snow.
A little - с неисчисляемыми
A few - с исчисляемыми
