Just to clarify if I remember my chemistry, the lower the pH the more acidic something is. ACV (acetic acid) will lower the pH of water.
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I would think that ACV would de-mineralize hard water to some degree so that may make hard water more palatable . Remember though that chickens are birds and some research facilities that specialize in rearing endangered birds put green food coloring in the drinking water to mimic the stagnant water the newly hatched birds encounter in nature. The green water is not better for them, they just recognize it better as water.Now, I have very hard water and I personally don't care for the taste myself. LOL So it is possible they don't care for it either....