I looked across the internet and would you believe how simple the recipe is??? Equal portions of Baking Soda and Borax. That's it. Easy as pie - and how inexpensive are these ingredients!!! I use 1-2 Tablespoons per load depending on how dirty the dishes are and if they've been sitting there for a while.
If you want specific measurements, you can start with 1/2 cup of baking soda and 1/2 cup of borax. This should make enough for you to try it and see how you like it!
I also put white distilled vinegar in the rinse compartment - this will keep your glasses shiny and without spots - and doesn't cost as much as those expensive rinse solutions you buy!