Hi bernie and all. We have just under 3 acres. I have 5 geese, 2 ducks, 3 chickens. The ducks have a waterer which is the smaller black cement trough from a big box store with an inverted 7 gallon water jug tipped into it onto a couple of blocks so it gurgles water out as they drink. The jug itself and a couple of blocks prevent them from climbing in this but leave plenty of room to drink and dip their heads. They also have a "swimming pool" which is a poly water trough about 4 feet long, 2 feet wide and a foot deep and very sturdy. I made them a little ramp on one side, and I put one of those retaining wall type blocks [not the huge ones, but bigger than a brick] on the other end so they have something to help launch themselves to get out. Now that it's October and the weather is cooler, I change the water in both of these on Mondays and Thursdays. In Summer, it's every other day. I have to scoop out a couple of buckets of water from the trough before I can tip it, then I rinse it and fill it with a hose. The fill time is about 12 minutes. I have a chair out there, and I just sit and check my email on my phone while it's filling. The geese usually come over and chat for a while, then go play in the fresh water and bite the hose and flap and squawk and dip and dive etc. I love watching them. This is our first year with them. Not sure what we'll do this Winter as it gets -30F here. I just bought another trough with a drain hole in it and will try making it a frame filled with some kind of insulation. Maybe that foam stuff. If I set the trough on a layer of that and then fill in around it with foam too, with a hose leading out of the drain hole and a ball valve, and insulate that too, and have a cover on it during the coldest weather, I'm hoping that will do it. we'll see. I've read that they do not "REALLY" need a pond at all. But they sure love it!
Originally, I changed the water every day, but that was just too much to manage. Either the water fowl had to go, or I had to scale down. [I have found the chickens easier, but the waterfowl are very fun, and my lady duck has started laying!] So far, the scaling down has worked great. If a person wanted to change it every time it looked dirty, you'd have to do it every couple of hours....
Good Luck!