it could be a number of thing's , o/bird's blowing too much water in / lazy feeder's , electrolite imbalance in the young , wet thrico/canker , try this before you resort to med's , 1 teaspoon sugar ,1/4 teaspoon salt disloved in some luke warm water , make this to every ltr that your drinker's hold's .
its nothing more than a form of electrolite . it may stop the scoot's /wet dropping's