There is a great deal of advice out there about water : from drinking an ounce for every pound of half your body weight, to nonsense! you need no extra water.
See my motto above.
Nothing quite beats a good study, and here is a report of two which indicate that many elderly people, having lost the impulse to drink water, are dehydrated and suffering both physical and cognitive consequences.
While it still comes as a surprise to have to think of myself as an elderly person, let me add on a personal note that I do have to REMIND myself several times a day to drink a glass of water. I have found that filling a container with water and putting it in the fridge each day serves as an aide memoire. If it is still full at the end of the day, I have not had enough to drink. Just a suggestion.
