As SaintJah says, better to get a full water loop and then get colored tubes for that. If you have the H100 already and are dead set on attempting that (IMO a bad choice), there are sites and videos that explain modding the Corsair H-series coolers.
Good luck with that
Water kits can be found for as little as $130 but I would suggest the XSPC Rasa 750 RX240 here for $170 - the Rasa water block is very good and the thicker dual 120 rad system works wellhttp://www.frozencpu.com/products/14182/ex-wat-181/XSPC_Rasa_750_RX240_Universal_CPU_Water_Cooling_Kit_w_Updated_Pump_and_RX240_Radiator_and_Free_Kill_Coil.html?tl=g30c321s1310
Installation of full water is no harder than an All-in-one, just a few more parts. I would suggest you read the stickies on water cooling - the risks of damaging mistakes is minimal - about the same as an all-in-one I'd say.