Answer:
1. He smokes very few cigarettes every day.
2.) She drinks one glass of water every day.
3.) He spends very few evenings at home every week.
4.) She writes about two letters every day.
5.) I drink one cup of coffee every morning.
6.) They can't buy many things, because they have very little money.
Explanation:
Use "very few" when talking about an object that has a different wording for the plural version. Letter and Letters aren't the same, but money is not "moneys" when it is plural, so you would use "very little." Also use "very little" when referring to character traits, such as patience or kindness.