While boiling water to purify it is recommended at all times, it is at moments an impossibility due to circumstances. Drinking water directly from the source without purifying sometimes puts one into contact with an uncountable number of bacteria infecting them with what is called river sickness.
Type disease (ingested); Save Fortitude DC 13
Onset 1d3 days; Frequency 1/week
Effect 1d2 Str damage and 1d2 Cha damage; Cure 2 consecutive saves