There are several recipes for homemade dishwasher soap. Why bother? It's much more economical than buying the stuff, even if you're at DollarTree -- plus you know what you're using here, chemically.
For each load:
1 Tablespoon Borax
1 Tablespoon Baking soda
2 Tablespoons of the following - 1 cup baking soda combined with 1 cup borax, and 2-3 tablespoons Fruit Fresh
For the rinse:
1 cup white vinegar, either poured into the JetDry vessel or placed into a cup securely placed into the top rack.
What's borax? It's a salt, naturally occurring in some parts of the USA as well as China, and it's used not only as a cleansing agent but also as a water softener and a preservative. Remember Twenty Mule Team Borax? It sponsored quite a few TV Westerns in the 1960s.
Sources: thriftyfun.com, naturalhomemadecleaners.com, answers.com.