All this talk about heat stroke and hydration is leaving me a bit confused.
There was a whole lake to swim in if you needed to cool off.
Even if you just dunked your arms and head the cooling effect would be quite strong.
No drinking water is a bit nuts though. Unless they intended to drink lake they should have had water, and even if they were not thinking about drinking lake water they should have a water treatment plan.

Cuppa tea?


I think Sue has a very good point.
It makes me wonder if they were even aware of the signs of heat distress.