When you purcase the kit from BRS
You get a bag that has mutiple fittings to connect the unit to various water sources.
There is the hose barb fitting, a faucet fitting, a copper piercing fitting, and maybe one or two more if I remember correctly.
Its the same connection package they have had for a long time.
Go take a look at the site, they have the info and pictures.
BRS also has many you tube videos showing almost every possible thing about their RODI systems. They show you how to hook these things up.
My RO membrane lasted for years so you should be good. Get a spare sediment filter and carbon blocks. I tend to look at mine and think hmmm needs changing and I want to do it right now. Also get a float shut off valve for your RODI reservoir. BRS sells one for something like $10 and I have it on my brute trash can reservoir. It prevents floods because you forgot and left it running. Have extra DI resin on hand.