I DIY a LOT of home cleaner recipes, but I am holding the line on dishwasher detergents. I buy the pods (when I buy the boxed powder I always seem to overpour and waste a ton), and I use white vinegar in the rinse-aid well.
I have tried DIY recipes and they just don't work with the machine. Someday we might simplify so much that we eliminate the washer altogether and just handwash, but in the meantime, PODS.
When I used to buy them at Costco, I would use the plastic bucket as my freezer compost container for when I was too lazy to take food scraps out to the bin. Just collect them in the freezer (no smell, magic!) and then take them out en masse when I have time.
For what it's worth, here is Bea Johnson's dishwasher detergent recipe from Zero-Waste Home. I didn't like it but maybe we just have hard water or something.
4 cups washing soda [usually avail near laundry detergent at superstores]
1 cup citric acid [avail at homebrew supply shops]
1 cup sea salt