I use the blue water jugs you put purified water in. It is the rectangular one with the white water valve on it (I think it is like 2.5 galons or something like that). The hole at the top is fairly large. You can get them for pretty cheat at Superstore. Anyways, the attachment that converts the square end of a powerhead to a round end (for a hagen 301) fits perfectly in the round part of the water jug valve. I then siliconed a piece of air tubing with an air valve attached to it. It works great. To fill up the jug, I just pull of the plastic power head attachement piece and fill the jug up.
I hope this makes sense. I should see if I can get a picture of the one I built. A few people have seen it and wanted to make one as well.
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