For horse owners with picky drinkers, Merkies suggests using litmus paper or a hard water test to determine if a sour acidic taste could be deterring their animals from drinking: "If the water is below 5 (in a litmus test), then it may affect water intake," she explained. "You can also use a water hardness test. The harder the water, the more basic it may be; the softer the water the more acidic it will be."
Additionally, she noted that in some instances adding a sweetener to acidic water can make it more appealing. Sweeteners can include small amounts of apple juice, cranberry juice, or Gatorade; however, it's advisable to discuss particular sweeteners with a veterinarian before using them.