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Drinking excessive water can be dangerous

NEW YORK April 14: Everyone knows humans need water and we can’t survive without it. We’ve all heard we should be aiming for eight glasses, or two litres of water per day.
This target seems pretty steep when you think about how much water that actually is, and don’t we also get some water from the food we eat?
Five medical and sports science experts were asked if we really need to drink eight glasses of water per day.And they all said no, in the piece for The Conversation. 
You only need to drink to thirst. The best gauge of your hydration level is the colour of your urine. 
You should aim for light yellow in colour; if very dark then you're dehydrated and need more water; if clear (like water) then you don’t need so much water.
Excessive water intake can be dangerous, particularly in those with heart conditions.
The kidney has a remarkable ability to concentrate water so if you are 'getting dry' the kidney will concentrate the urine and send a message to the brain to drink more.  
No it’s not necessary to drink eight glasses of water a day. 
It appears the origin of the recommendation to drink eight glasses of water a day may have come from a publication by the National Academy of Sciences Food and Nutrition Board in 1945, stating 'A suitable allowance of water for adults is 2.5 litres daily in most instances'.
Women who drink three pints of water a day half their risk of getting urinary tract infections, a study in October claimed.
For most female adults, UTIs are a painfully regular experience. It causes a burning sensation, severe cramping, and pain during urination.
While the infection is most commonly contracted from unprotected sex with a new partner, some girls - even in relationships or using protection - find it difficult to keep the infection at bay.
But researchers at the University of Miami School of Medicine showed that women with a high intake of water have roughly half the risk of their lesser hydrated peers.
Scientists monitored 140 healthy premenopausal women who had at least three UTIs in the last year and reported low daily fluid intake. 
The recommendation also stated that 'most of this quantity is contained in prepared foods', a fact which is often overlooked.
We do get a lot of our water intake from the foods we consume. Cauliflower and eggplant for example are 92 per cent water. 
A one-size fits all approach is unlikely to be helpful. Healthy adults may not need to drink an additional eight glasses of water a day. 
On the other hand persons with certain diseases or living in very hot climates may require larger intakes of fluid.