We started using a rain barrel as a water source for our chickens. We have it attached to a gutter on our chicken coop and it runs off of a corrugated steel roof. I read that Apple Cider Vinegar is a good way to keep algae and bacteria down but I'm just not sure how much to put in the barrel or if there is such thing as too much ACV. I noticed the water in the barrel is starting to have an unpleasant smell so I'm worried it's too contaminated to feed to the chickens. Does anyone add ACV to the water feeder as well? If so, what proportions are best to use? Any advice on using rain barrels as drinking water for chickens would be helpful!