Senoufou, the wet undies on the head has the advantage of giving your friends a laugh, lots to be said for that. But I have seen lots of guys working outdoors in the US South who will roll up a small wet towel and keep it around their neck while working. It does help with lowering the body temperature, which of course is very important when heat gets to the danger point.

Best wishes to everyone suffering, and remember to check on neighbors who need it.