Kind of like that. The fitting has threaded ends to attach to the cold water line and then has the connector for the RO tubing as well.
Go to Home depot and where they havle all the fitting for the RO tubing and such, youll find it there. Then all you have to do is drilll 1/4" hole just above the P-trap on the drain and attach the collar for the waste directly over the hold, screw the collar together to seal it over the p-trap and fire the bad boy up, your good to go. No need to hire a plumber, depending on where your located I may be able to come give you a hand if you need it.