ooty,
The water intake is right against the bunk board in this picture; a little challenging and frustrating after crawling under the trailer only to find this to attach a 'fake-a-lake'. That's why I modified my boat for a hose attachment with a couple of ball valves. It's fairly tight getting stuff in there and you have to be real careful about the correct valve being open.
There is a nondescript black rubber hose (yeah, they're all black!) approximately 5/8" OD with a bolt in the end attached to the top of the engine with a clip. Pull the hose out of the clip and un-snake the hose all the way to the bottom of the bilge (below the engine). Remove the 'T' handle drain plug near the front of the engine and carefully snake the hose through the drain being carefull to remove all kinks. When all the hose is below the engine, remove the bolt to drain the engine oil by gravity.
I remember a few years ago almost panicking because someone needed a jump and I couldn't find the battery!

An owner's manual with lots of pictures would have been real helpful. After removing the engine cover and all the floor panels out, look around for a while and some of the hoses, cables & wires will eventually start to make a little sense.
