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

[Carl]

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?