Water intake note

At last a sensible answer about the water intake; question which has been left unanswered for so long!
Water is produced in the body through metabolic activity, so this is one source of it.
Of course, it depends what people eat and how much water is contained in the ingeeested foods, but this article gives an indication:

In the normal resting state, input of water through:
¬ ingested fluids is approximately 1200 ml/day,
¬ from ingested foods 1000 ml/day and
¬ from metabolism 300 ml/day,

totaling 2500 ml/day.

Water losses:
Some fluid is lost through perspiration and as water vapour in expired air, but it cannot be easily measured. Some sources say between 500 to 800 milliliters of water for a daily loss.
In addition, fluid is lost through urine (1500 ml/day in normal resting state) and in faeces (100 ml/day)