You could do this...Have a 5 gallon bucket sitting on top of your case, and run 1/2" tubing down and use that for your WCing setup, then have another 5 gallon bucket on the ground collecting the water is it comes out of the other 5 gallon on top of the case. Now just use a pump to pump the water back to the 5 gallon container, and you now have pressurised water in your case...
Or you could just hook your 1/2" line directly into your house's water lines, and connect the other end to the sewer line, so you could have cold water, slowly running through your case forever.
That 2nd idea doesn't sound like that bad of an idea, as long as you kept the valve mostly closed so you don't have a $2,000 water bill at the end of the month
