Dishwasher detergent can get expensive...especially if you like the nice stuff instead of the dollar store junk. It's ridiculously easy to mix up a batch for yourself.
You use equal parts of Borax and Baking soda, mix in some essential oils....and tada! You have dishwasher detergent. I use one tablespoon per load, BUT using just that mixture will leave a funky white film over all of your dishes. Most people use powdered citric acid mixed in to prevent the white stuff, and apparently you can even use a couple packets of Lemonade Cool-Aid. I have an aversion to Cool-Aid, so I haven't tried it. What I do is use....wait for it.....vinegar! I have a handy dandy spray bottle of vinegar under my sink, and I just use it and spray vinegar into my detergent mixture after I put the tablespoon of it into the dishwasher thing. I just keep spraying until the container is mostly full, then close it up and run the dishwasher like normal.
The End.