There should be instructions on connecting to the fridge itself in the user manual.
The water supply connection will vary depending on the type and size of the existing water supply line.
You will need a shutoff valve (to connect to the existing water supply line), some 1/4 inch ID water line (to go from water supply to fridge) and some fittings to tie into an existing water line.
Your best bet is to go to a plumbing store (Home Depot is good) and explain what you are doing and the type and size of water line you are connecting to.
2007 Surveyor SV230 - 200 Watts Solar/MPPT Controller - 230 AH Battery Bank - 600 watt PSW Inverter - (2) 2000 watt Inverter Generators - LED Lighting - Boon Docking 99% of the time.
2009 F150 - 5.4 Litre - 6 speed - Tow Package