fry,
if you buy the ro unit, it will come with all the accessories needed to install it(except screw driver). the inlet and drain hose is connected via a saddle valve, the inlet just clamps onto the water pipe(cold water, dont use hot!). It is seriously a 5 minute install IF you have a water source and drain near by.
They can also be uninstalled easily by either removing the 1/4" hose and shutting off the saddle valve and leave it there, it wont leak and a replacement is like $3, if that, or replace the source pipe you pierced with the saddle valve. for the drain, remove the saddle clamp and seal the hole with water proof tape.
~b