Other thing that is important -- however -- is mineral water. Drinking distilled water in extreme heat, if people are perspiring a lot, can cause heart issues. Either take minerals or add some raw apple cider vinegar to the drinking water.. or drink propel... along with water.
Excellent point!
If I had needed it - I imagine I would've eaten DIRT out in Death Valley if it got too bad. As it was - we got out right when it started to get hot again the next day. :)