What is the least amount of nutrition and hydration a 92 year- old bedridden man needs to survive?

"For elderly adults, 5 or more 8-ounce glasses of water are recommended each day. And that number has a special significance, as one study confirmed that seniors who drank the recommended amount of water faced lower rates of fatal heart disease."

Source:dripdrop/dehydration-seniors-risks-symptoms-prevention/

"For elderly adults, 5 or more 8-ounce glasses of water are recommended each day. And that number has a special significance, as one study confirmed that seniors who drank the recommended amount of water faced lower rates of fatal heart disease." Source: dripdrop/dehydration-seniors-risks-symptoms-prevention/

My grandmother is 87, was 5'7" at one time, current weight is 125lbs, sedentary, soft food diet. It seems that making sure she takes in at least 1500 calories a day helps her maintain her weight. Since she eats so sparingly, she has two (2) Ensure Plus a day (700 calories) and I use alot of heavy dairy products to add calories to the high protein diet and I juice her veggies and fruit. I had to stop her snacks because she stopped eating full meals ( she was getting Cliff Bars). She was in the hospital recently and diagnosed with mild dehydration and a UTI because she simply wouldn't drink enough water. It's a really tough thing to get them to eat enough calories with nutritional value compatible with their health problems and keep them adequately hydrated. I am trying to keep her at home and out of a nursing facility, but it appears to be a losing battle. Hope this helps and you have a better experience.