Recent heat wave here in Western Canada, British Columbia, was over 40C in most areas. Resulting among others in over 400 deaths in the Vancouver area alone, mostly among seniors. [ https://www.cbc.ca/news/canada/british-columbia/sudden-deaths-heat-wave-b-c-1.6086770 ], deaths related to this heat.

For the past 50 years in Canada I have been subjected to many heat waves, some during travel for work (Ottawa) and also Quebec, Montreal, during summer. I learned then that in addition to drinking lots of water, which really is only for your inside, that also the outside of your body, the skin, is heating up tremendously.

One fact is: Heat always rises, while water always runs down. Meaning, that during a heat wave, the body temperature rises, and the upper part of the body needs to be cooled down as long as the heat wave lasts, that means 24/seven.

How to take at least simple precautions: Use a cotton kerchief for the neck (I have many from my Cowboy days in Alberta), soak it thoroughly in cold water and tie it around your neck. This prevents heat rising to you head, and knock you out. Secondly, soak your T-shirt in cold water and wear it. As the body heats up, this needs to be repeated hourly. In addition, if I have to go out somewhere, always take a bottle of cold water, to re-soak and drink. I have done this regularly for every bicycle trip as well.

I survived this last heat wave, alone, without anybody helping me, and I am over 80 years old.