Chickens can be messy but their water doesn’t have to be. For the cleanest water without having to clean it yourself, this waterer is for you. Moreover, some of the automatic chicken waterer come with No-Roost Cap that prevents hens and chicks from roosting on your waterers.
A List of Top 10 Best Automatic Chicken Waterers 
1. RentACoop Automatic Chicken Water Nipple Cup
First, the nipple is automatic fill cup. The cup fills automatically and replaces any water drank by your chickens. Second, it keeps your hens comfortable in the warmer months.For example, it is great for 80 Degree days. Also, the cup is large enough for hens to dip their wattles in. Last but not least, it works with 5 gallon buckets, rain barrels, PVC pipes, storage container and more. Especially, it is perfect for baby chick.
2. Harris Farms EZ Fill Poultry Drinker, 3.5 Gallon
This easy-fill, easy-clean poultry drinker is molded from long-life plastic. It features a top-fill bucket using a float in the base to allocate water to the rim. This drinker is excellent for indoor and outdoor use and accommodates up to 56 chickens or game birds for 3.5-gallon or 100 for 6.25-gallon.
3. Chicken Waterer, 5 Gallon
It is 100% Food Grade and BPA Free Plastic. New Horizontal Nipples prevent ground/bedding from getting wet. The No-Roost Cap prevents chickens from roosting. The lid of your waterer will now be spotless when you go to refill it. 5 Gallons/4 Horizontal Side Mount Poultry Nipples lasts 4 hens more than 10 days. No setup required. Easy to fill – Removable cap on lid.
4. Chicken Waterer, 2 Gallon
100% Food Grade and BPA Free Plastic. Complete system. No assembly required. New Horizontal Nipples prevent ground/bedding from getting wet – 2 gallons lasts 4 hens more than 5 days! Comes with new No-Roost Cap that prevents hens and chicks from roosting on your waterer! Easy to fill – Removable cap on lid. Comes with some of the best instructions you’ve ever seen!
5. RentACoop Chick Waterer 1Liter Drinker Plus Red Versatile Nipple
The red side nipple makes placement of the water easier as it gives you more options. It makes you easier to train the chicks as they are attracted to the color red. The choice of which nipple to use is up to you. Nipple drinker sits or hangs above the litter so water is always clean. Many ways to water includes simple metal bracket for attachment to a cage.
6. Oasis Chicken Waterer Kit
Build a Fully Automatic Waterer- with this comprehensive kit and a bucket or similar container. Connects to a standard garden hose. U.S. Patented Float Valve keeps the bucket full. Right angle adapter relieves garden hose strain and allows for a variety of placement options. Simple and Reliable Cups. Fully Automatic. No float tabs. No triggers to peck. OASIS Cups are LARGE – Nearly 3 Inches in Diameter.
7. Harris Farms Hanging Poultry Feeder
The Free Range heavy-duty galvanized feeders feature rolled edges for safety and a convenient hanger/carry-handle. Design makes for easy 3-position height adjustment and is suitable for game birds, chickens and young chicks. 15 lb. capacity feeds 15-30 birds.
8. Premier Chick Nipple Drinker with Wall Bracket
Nipple drinker sits or hangs above the litter so water is always clean. Wall bracket is included for hanging nipple drinker on the wall along with a lightweight wire hanging bracket for attachment to cage. 1 liter capacity or approximately 1.06 liquid quarts. Helps to keep nipple drinker above the litter so water is always clean and fresh.
9. Premier 1 Supplies Chick Nipple Waterer
This one comes with 2 packs of Chick Nipple Drinkers. Each drinker is approximately 7 inches high with a 1 liter capacity. They hang above the ground to keep your chicks’ water clean and fresh. Package includes 2 metal brackets to hang these drinkers outside almost any cage. You also have the option of placing this waterer directly on your chick’s heating plate, which will place the nipple at the correct height for drinking
10. Little Giant Plastic Waterer with 750 Red Base
Complete gravity-feed poultry waterer with 1-gallon capacity. Jar is molded from durable transparent polyethylene so the water level is always visible. Base is heavy-duty polystyrene. Easy-fill screw-on design. 9 inch diameter by 10.25 inch high.