I've been thinking about doing something like this too I got the idea from this picture I found on a blog
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I know on the autopots site they sell an aquavalve kit called "easy2go," seems like all you need to get is a reservoir. Looks like a really cheap way to get into autopots, I may just try it out. But anyways it seems like it has been done before with good results!
Looks like a cool idea. But I'd be worried about Algea.