csm, I should add that to the post where I log all of your promises!
JMattes, My pump/res combo sat on the bottom of my case. I would remove the lid on my res and empty the water from it. This actually drained both tubes connected to it because of it being on the bottom of the case. I disconnected both tubes from the pump/res. One tube was placed into a large cup. I actually blew the water through the loop by attaching an extension through the other side and blowing with my lungs.
I never spillled a drop, and I drained it 5 or 6 times that way.