I use these,
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Couldn't find a better picture ( the high one was empty and just hooked up there out of the way) I've since moved them in under the roof of the coop as the fussy girls didn't want to stand in the sun. A bit of dirt gets in the red cup but I just wash it out, inside I've never had to clean just a rinse when I fill it, it's still pristine. With now 7 chooks using one waterer it's lasting 2-3 days till dry, in summer would be 1-2 days till dry but I will have 2 back in there by then. My dog just has a plastic bucket lol
I have had a bag of those drinking cups for more than a year, but unfortunately we have not had the time to install them. Lol, we even have a water tank sitting next to the coops , one day.........