Combine all ingredients in a widemouth container with a lid. (I use a recycled ice cream bucket). Add essential oils as desired (but they are not necessary). Use 1 tbsp to 1/4 cup per load of laundry.
Notes on ingredients: You can use any kind of soap - non-superfatted handmade soaps are wonderful! I just grate mine with a cheesegrater. Washing soda can be difficult to find in some areas of the world, I understand - usually it is found in the laundry detergent aisle of a supermarket. If you cannot find it, ask a store manager to order it for you. This recipe is VERY inexpensive and I have found it to work really well!
More info: Local folks - check your local grocery stores for most ingredients - Fareway, Dahls, Supervalu. If they don't carry the ingredietns you need, ask the manager and they might stock it for you! Also, our friend Colleen from FL wrote in with this link - she buys her laundry detergent supplies from this online source: soapsgonebuy.com Thanks Colleen!