We've taken refuge in an unoccupied corner of the local ruins for the night. The water here seems clean enough for drinking, and I even jumped in myself for a bit, once I was sure the area was safe. Sam's not doing so well. They're suffering from the sickness - growing weak, losing hair. My parents told me that that didn't really happen before the end - that people got sick, but you could usually figure out the source; that there were vast buildings and dedicated, brilliant healers who could help you. But for Sam all we can do is get them some extra water and let them rest a bit more. I don't know how much longer we can keep them with us, though, if we want to keep moving.