Guiding value: 1.5 litres a day
In general it is assumed that the amount of 1.5 litres covers the daily fluid requirement of elderly persons. Of course some of the liquids are also consumed via solid foods (fruit, vegetables, soups etc.), but the most part needs to be actively ingested in the form of beverages.
The following beverages are well advised
Coffee and tea are not a suitable option to quench thirst, but may be counted a fluid intake. It is a common misconception that beverage with caffeine lead to dehydration. In general, enjoying of up to four cups of coffee a day is reasonable.