Gail Damerow says the average chicken drinks between 1 and 2 cups of water a day.
Here is an older thread with some discussion on the matter
https://www.backyardchickens.com/threads/how-much-water-do-chickens-drink.151797/
Here is an older thread with some discussion on the matter
https://www.backyardchickens.com/threads/how-much-water-do-chickens-drink.151797/