Andrew Huberman called it the Galpin Formula after Dr Andy Galpin.
Hydration general formula:
Your body weight (in pounds), divide that by 30, and consume that number (in ounces) of water every 15 minutes.
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hydration
Ibn Sina in his Canon said,
“Cold water.
Water which is only moderately cold is more healthy than all others, because it stimulates the appetite and strengthens the stomach. Nevertheless it weakens the nerves and is harmful for cases of inflammatory disease in the interior organs.
Very cold water should be taken after food and then only in small quantity (referencing Aegineta).
Tepid water incites nausea.
Warm water (that is, water which is a little warmer than tepid water), taken on an empty stomach, is cleansing both to stomach and intestines. But it has a weakening effect on the stomach if taken often.
Hot water is beneficial for the following conditions:
Head: "cold" headache; inflammation of the eye; parotitis, quinsies; "dry" gums; postauricular inflammations.
Mental conditions —epilepsy and “melancholia."
Chest: asthma, solutions of continuity in the thorax; ulcers of the diaphragm.
General: rheumatic pains. Diuresis. It relieves painful micturition.
Female ailments : it evokes menstruation.
Hot water interferes with digestion and makes the food swim about in the stomach. It does not quench thirst. It may lead to dropsy, and hectic fever, and emaciation.
Very hot water is of great, value in colic; it also disperses flatulence.”
It is mustahabb to expose oneself to the rain and let some of it flow over one’s body, because of the proven report from Anas (may Allah be pleased with him) who said: When we were with the Messenger of Allah (blessings and peace of Allah be upon him) it rained. The Messenger of Allah (blessings and peace of Allah be upon him) lifted part of his garment so that the rain could fall on him. We said: O Messenger of Allah, why did you do that? He said: “Because it has just come from its Lord, may He be glorified and exalted.” Narrated by Muslim.
Ibn Sina in his Canon said, “Rain water is the best of waters, especially when it falls during summer or during a thunderstorm.”
Ibn Sina in his Canon said,
“Purification of water.
Bad water may be purified by sublimation and distillation. If that is not feasible, boiling will suffice, for boiled water, as the learned know, is less likely to cause inflammation and passes more rapidly through the body.
Ignorant persons believe that when water is boiled the attenuated part is dispersed, and that therefore it is made denser; hence they think it is better not to boil water. But as you know, the very nature of "water" means that its particles are alike in attenuation and density. It is pure, simple [in the scholastic sense], and will not thicken by boiling except in virtue of a cold quality being dominant in it, and of earthy particles being plentiful in it, which, although extremely minute, are not easily separated out or precipitated. They are not plentiful enough to break the continuity of the water and are too small to separate out by standing. Hence they are bound to remain admixed with the substance of the water.
Boiling removes the density which the quality of coldness produced; the particles of water are then forcibly rarefied and the substance of the water becomes more and more rare, until the heavy earthy particles hitherto suspended burst loose and fall down and sink to the bottom. A nearly quite pure water remains behind.”
Ibn Qayyim al-Jawziyya in “Prophetic Medicine” said, “The Prophet [pbuh] used to drink honey with cold water, and this is an especially effective method to preserve health.“
An October 2019 study by the University of Waterloo looked at impaired kidney function and hydration in a new computer model that, “simulates the muscle contractions that move urine from the kidney to the bladder.”
"People who have high blood pressure are typically given a water pill, so they pee a lot to lower their blood volume and in so doing lower their blood pressure … These patients are frequently also given another drug that targets a hormonal system which will affect the kidney as well.
"A lot of people are on these two drugs, and they will be fine. But one day they might have a headache and take an aspirin, and the three of these drugs together can hurt your kidneys."
“that unless a patient is properly hydrated, taking the two blood pressure drugs and an aspirin concurrently could cause acute kidney injury. The injury happens when there is an insufficient water balance, which can lead to concentrated urine from a build-up of waste in the body.”
It might be useful, given this week’s weather, to remind ourselves of the NHS guidelines on hydration. The Eatwell Guide says we should, “drink 6 to 8 glasses of fluid a day. Water, lower fat milk and sugar-free drinks, including tea and coffee, all count.”