They are easy to build with some horizontal nipples and a food grade bucket with a lid from like Lowes. Then in winter you can use a bucket heater like the one I posted today. I like how it keeps the water clean. They do have to be made to try it the first time, but they use it well. Since they do like an open one better I do offer one in the heat of summer.RentACoop 5 Gallon Chicken Waterer - 4 Horizontal Side Mount Poultry Nipples (Corner) https://www.amazon.com/dp/B016AFYT4Q/ref=cm_sw_r_sms_api_i_aH.IFb33CC589
Thinking of switching over to this type of waterer.