Within the context of the human body the word "hydration" refers to the process of causing your tissues to absorb water. This is done primarily via a process called osmosis in conjunction with minerals and electrolytes whereby you intake water such that the concentration outside the cells exceeds that concentration inside the cells and the cell membranes attempt to equalize the gradient as required.
I am particularly concerned with water quality for purposes of hydration. I go so far as to steam distill my drinking water. My distiller is a stainless steel device and I make several gallons a day using it. The particulates I have discovered as a by product were rather disconcerting early on.
They begin as an oily appearing yellowish ash and it all accumulates as scale inside the boiler. I use white vinegar and citric acid to remove them to my immense satisfaction. I have a carbon post filter for the volatile organic compounds inherent to the process.
Today is National Hydration Day. It is observed in the United States each 23rd of June. It was originally created under the auspices of a company called SafeTGard to celebrate one coach Victor Hawkins who invented a special hydrating mouth guard for the health of his players on the field. This product is now commercially available from SafeTGard.
The increasing temperature and level of exertion are directly proportional to the need for more hydration. It is a way you may exercise yet avoid problems like heat stroke and dehydration though you may be in the sun for extended periods.
This day is to raise awareness of the importance of maintaining hydration ... particularly during times of physical exertion.
Happy National Hydration Day and keep yourself hydrated for better health.