Well the basics of wine making are just fruit, water, sugar and yeast. Most of us use the other ingredients so we can obtain complete fermentation (nutrient, energizer, acid blend etc), for clarifying (pectic enzyme, Irish moss, fining agents), for sterilization (sulfates like campden), or for flavoring/body (both acids and tannins).
When it comes down to it depends how sterile you are when you are putting all the ingredients together, how long you're willing to wait before you bottle or drink, and if you want to save the headache of a "stuck" fermentation.
I hope my list helps you with some of the basics.
