It is scary how fast people can go down hill without water. We regularly go camping up on the MN/Canadian boarder in the BWCA - going lake to lake in canoes.

It is scary how fast people can go down hill without water. We regularly go camping up on the MN/Canadian boarder in the BWCA - going lake to lake in canoes. Usually we pack in a filter (or chemical purifiers, way back) to make sure folks don't get beaver fever. One guy opted to not drink the purified water... and went downhill fast the next day. Had to paddle him out and take him to the ER. Not sure what he was thinking - that the .5L of water he took in was enough to get him through 3 days.