That's funny, I built almost the same thing about a year ago out of 1/2" CPVC. The guy is right, the CPVC end caps caps are bigger than the bottle opening. I got some 1/2" solid PVC stock from grainger, cut it into 1/2" long rods, and hammered it in the end of the CPVC. Then a hole was drilled through the solid stock.
Unfortunately I couldn't get mine to work properly. All the flow was at the first few pipes next to the supply, the rest were barely a trickle. I also didn't glue the long pipes down into the manifold, so they would pop off pretty quickly and kill the pressure. I didn't want to glue them down so that they could be removed for getting out buildup (original purpose of this thing for me was a bottle washer). I just stopped messing with the thing seeing how much additional work was needed to get it working. And I haven't washed a bottle since