What are the basic ingredients of wine?

Generally, you do not add water to wine. The exceptions are mead, those "country" wines that require boiling to extract the flavor and fermentables, and oddball wines such as coffee and tea wines. Yeast nutrients are needed to support yeast growth in country wines, not in g wines. It is generally a good idea to kill wild yeasts and bacteria wirh campden tablets a day before pitching a wine yeast. You can stop fermentation a day before bottling the same way, if you want.