This article from Apartment Therapy, 25 Green Cleaning Recipes for the Entire House!, offers simple and affordable recipes using 5-6 basic ingredients. For example, the ingredients and supplies listed below are everything you’ll need to make your own kitchen cleaners:

Ingredients:
Vinegar
Baking Soda
Lemon
Essential Oil (optional)
Water
Dish soap

Equipment or Tools:
Spray bottle
Bowl
Sponge
Scrub brush
Measuring spoons