I had a terrible problem until I installed the PVC feeder below. Not a crumble has been spilled since. AWESOME. Feeds a dozen chooks, no waiting. I fill the outside pipe once a week (they free range 2-8 hours a day).
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And I have had no dirty water issues since I installed this (see hose in corner of coop at right of pic; we don't use the red cups anymore):
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Some great ideas here, thanks for sharing!