Any Beast or Humanoid that drinks water tainted by Sight Rot must succeed on a DC 15 Constitution saving throw or have the condition until the contagion ends.
Sight Rot
Condition · Magical Contagion
Status Effect
Sight Rot
This condition changes how a creature can act, move, perceive, or interact with the world until the condition ends.
Rules
6
sections
Effects
Fighting the Contagion
Magic such as a or spell ends the contagion immediately. A character who is proficient with an can use it to create one dose of nonmagical ointment, which takes 1 hour. When applied to the eyes of a creature suffering from Sight Rot, the ointment suppresses the contagion on that creature for 24 hours. If the contagion is suppressed in this way for a total of 72 hours (requiring three doses and applications of the ointment), the contagion ends on the creature.
Spreading the Contagion
Any Humanoid that makes skin contact with a creature infected with Sight Rot must succeed on a DC 15 Constitution saving throw or also become infected with the contagion. On a successful save, the Humanoid can't catch the contagion from that particular infected creature for the next 24 hours.
Reference
Rules Availability
SRD 5.2