How many drinks a day, young and old, should drink?

How many drinks a day, young and old, should drink?
Of course, our daily water intake is not as much as we expect it to be That age also helps with our health. Dr. Heang Ratana, a general specialist, is divided as follows:

9 kg should drink from 1 glass / day
18kg should drink from 2 glasses / day
Weight 27kg should drink from 3 glasses / day
36 kg should drink 4 glasses / day
45kg should drink from 5 glasses / day
Weight 54 kg should drink from 6 glasses / day
Weight 63 kg should drink from 7 glasses / day
Weight 72 kg should drink from 8 glasses / day
Weight 81 kg should drink from 9 glasses / day
90 kg should drink from 10 glasses / day
99kg should drink from 11 glasses / day
At 108 kilos should drink from 12 glasses a day

145kg should drink from 16 glasses / day
If we find it difficult to determine our body weight, doctors say it may be possible to drink 12 glasses of water or 2 liters / day for adults and for infants up to 6 months At least half a liter, and children should try to drink at least 2 glasses of water or 1 liter / day.