OK, I know... this is so totally off topic of what I usually blog about, but I read this on Happy Happy Joy Joy's blog (http://www.obsessedwithscrapbooking.com/) and decided I might just want to try it out.
She got the recipe and the idea from here: http://beingcreativetokeepmysanity.blogspot.com/2011/01/dishwasher-detergent.html?m=1
1 box Arm & Hammer Super Washing Soda
24 packages of unsweetened lemonade drink mix, like kool-aid. (**Note: lemonade will stain soap dispenser yellow, another option would be to use citric acid instead of lemonade)
3 cups Epsom Salt
If you need a rinsing aid use vinegar. I personally use Lemi Shine as my rinse aid and it works wonders. I just sprinkle about a tablespoon in the bottom of my dishwasher before I start it. This stuff is awesome!!
Mix Borax, washing soda, salt and lemonade together in a large, very large, bowl. When ingredients are mixed together well put soap in a container of your choice. I picked up a container at Walmart in the kitchen center with a pouring spout for $5.00 and it is big enough to hold an entire batch of dishwasher soap. The soap does harden up after a while so you may also want to store it in 2 different containers, one should be air tight to help if from hardening.
It even has a pouring spout to make things easy.