Other practical strategies to increase fluid intake include:
When the mercury hits above 40, it is challenging for all of us to meet our hydration needs. It's even more difficult as we get older as our thirst is often reduced and we don't always know when we need more to drink. Women need at least 8 glasses (2 litres approx.) of fluid per day and men need at least 10 glasses (2.5litres approx.). In the hot weather it's likely those quantities increase even further.
Food has fluid too - up to 500 to 700ml depending on the food eaten, so the actual fluid that needs to be taken as drinks to prevent dehydration may only be 1200 to 1500ml.
Water, tea, coffee and diet cordial drinks provide fluid but no nourishment.
It is a myth that tea and coffee are dehydrating for regular users. If someone drinks tea or coffee on most days then the body adapts to the potential diuretic effects- they are a good source of fluid.
Juice, milk, milkshakes and commercial supplements provide excellent nutrition at the same time as the fluid so are great choices.
Even ordinary cordial, soft drink and sports drinks provide sugar and some valuable calories when someone is underweight.