Tony writes:

For golf I do that with Gater Aid or other sports drinks in liter
bottles -- walking hilly courses in hot weather is thirsty work. The
Army tells its members if they are doing hard work in the summer, that
if they are not ****ing they are not drinking enough. Thirst is NOT a
good measure of need in those circumstances.

Thirst is reliable except for heavy, short-term exertion, especially
in warm weather, when one may lose water very quickly. But the Army
is right--as long as your bladder is filling every three hours or so,
you're not dehydrated. If you go all day without having to urinate,
you need to drink a lot more water.

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