What Arduino products would I need to get something started to actually "try" and build a system to begin prototyping some sort of controller? As I said before I have a friend who can and will program but just don't know what hard parts in the electronic side I need to purchase.
You will need to determine what motor controls your auger so you can get a suitable arduino motor controller.
You will need something like a solenoid valve to control the water flow and some why of interfacing it to the arduino.
Switches to start/stop the sequence and maybe LED's or an LCD display to give operator feedback.
RS232 to TTL converter to interface the weighing scales to the arduino.
There is invariably other items that you don't know you need until the project is started.