Questions & Answers about Я хочу ещё немного воды.
Воды is the genitive singular form of вода.
In Russian, after words of quantity like немного (a little, some), you almost always use the genitive case, not the nominative.
- Nominative: вода – water (as a subject, dictionary form)
- Genitive: воды – of water / some water
So the structure is literally:
немного воды = “a little (amount) of water.”
Воды here is genitive singular.
You use genitive singular of вода in several common situations:
- After quantity words: немного воды, стакан воды (a glass of water), бутылка воды (a bottle of water)
- For absence/lack: нет воды (there is no water)
- For possession (with у): у меня нет воды (I don’t have water)
The dictionary form вода is nominative; воды is one of its inflected forms.