Today install a ro system, water supply for coffees machine and faucet, ro water system can be proses 50 gallons per day. Take a look below pictures.
Connect inlet water join.
Install Undersink Reverse Osmosis System. 
Connect Storage Tank. 
This connector is for coffee machine. 
Joined. 
Continue join the faucet. 
But the faucet mount is too short. So must extra faucet connected. 
Faucet completely install. 
Last step is make a hole for drained water.