Fill a one gallon jug with about one inch of very hot water. Add the gelatin and shake really well to dissolve. Add the rest of the water and remaining ingredients.
When adding the vitamins, it's best to do so the day before you need to use this, thus allowing the pills plenty of time to dissolve.
Use it every time you water your plants. No need to add anything.
This is recipe based on one I found in a book called "Plants are Still Like People" by Jerry Baker. I've been playing with it for a couple of years and you may have seen one of the earlier versions here.
I decided to omit the ammonia when using my tank water this year, when I started my container vegetable garden. The ammonia provides nitrogen and too much is not a good thing. In fact, you might even consider using a flowering plant food if you want to grow such goodies as melons, tomatoes, and other "fruiting" plants in your garden, as Baker suggests in his book. He also recommends changing your fertilizer regularly since each plant reacts differently to each kind of fertilizer. I'd like to add that you should also avoid fertilizers higher than 15-15-15. Lower dosage ones are easier to measure out the ten percent, plus they are less likely to burn baby and newly transplanted plant roots.