Here is a list of parts and a how-to. But think first, ie: remove the lid before cutting and making a mess so the can stays clean, or better yet get a spare lid, and make sure you get food grade tubing. Otherwise it is pretty simple.
I have one of these and it works pretty slick. No modification needed to the can or pump. Plus its under $13 delivered. The photos on Amazon show it on a Carboy, but the ID of the pump fitting fits snug-enough slid on the threaded nipple of the Scepter. I probably would not drive with the pump attached, but with the water can stationary, it would be unlikely to fall off.