For dogs with avoidance issues and water bowl phobias, it’s worth trialing a variety of different dog bowl types in an effort to encourage them to drink more.
For example, some dogs don’t like and/or are fearful of stainless steel bowls. This could be due to the reflection in the water or maybe even the sound of the metal on the ground or against their ID tags as they try to drink.
If this is the case, try another type of bowl i.e. plastic, ceramic, silicone, or glass. You could even try placing the bowl on a non-slip mat to dampen the sound and prevent it from sliding around (which might also be putting them off).
For dogs with an aversion to plastic bowls, a plastic allergy could be to blame. Try another type of bowl.
Bowl size and shape can also deter some dogs. Make sure your bowl is the right size for your dog (not too shallow or too deep), and keep switching them out until you find something that works.