And for The half inch tubing, you want the same style Semi rigid tubing just like the stuff that’s already on your RODI unit just in the larger size. They do carry it at Home Depot.
The only other consideration I can think of is that you may want to add a ball valve on the feedline so you can regulate the flow rate. They will have little ball valves with John guest fittings right there in the same rack at Home Depot. You could use that part to connect to the pump, instead of a female to female connector, but then you would have to stick your hands In the water every time you go to make an adjustment. Then again you wouldn’t have to do it very often.