At this time of year, check natural water supplies if your horse is on pasture. Water troughs or tanks used for outside horses should also be inspected and cleaned periodically and contain fresh, clean water at all times. When it is hot and humid, stabled horses may need to be watered several times daily if water is provided by bucket. Place two buckets in each stall if you can't water them at midday. Periodically wash these buckets thoroughly.
Some horses have a habit of dropping feed in their water buckets.
If you use automatic waterers, check to be sure they are clean and functioning properly. Horses that are hot and sweaty after being ridden should not be allowed to drink all the water they want. But, as you cool them out by walking, it is okay to allow them to have a few swallows of water. But, keep walking them until they are completely cooled out. Water quality is also important to your horses and may be more critical in hot weather.