how to mount the gallon jugs to the 4" PVC pipe
 

3 questions - Can you be a little more specific as how to mount the gallon jugs to the 4" PVC pipe, the pictures aren't all that clear? And, what nutrient would you use if you're growing a variety of vegetables, tomatoes, peppers, lettuce, etc, all being fed from a common nutrient tank? What emitter rate do you use in your drip system?

I just drill a hole big enough for the gallon jugs to pop threw the 4" sewer pipe. The jug is held up by the wood or metal frame. The kind I sell is a general purpose hydroponic mix ( 10-8-22 ). It does say to add 1/4 teaspoon of epson salt to the gallon mix if you are growing vegetables like tomatoes or cucumbers.
I don't use emitters I just let the solution flow every 20 minutes.