Supposedly fluid intake and the "glasses of water" stuff are separate, so that if you drink for example Orange Juice, this does not count towards your water intake. That's not what my doctor said. He said that when you have the flu, drink plenty of liquids.
Yes, when one is sick with the flu or feverish, fluids help prevent dehydration and the pain associated with it.
Well, my husband is the type of guy who goes to bed and does not eat or drink anything when he has the flu. Then he comes down with a fever and still will not eat or drink anything. He just wants to sleep it off. I have had to argue with him to try to get him to accept a thermometer in his mouth.
Finally, when I do get it into his mouth, he is surprised at how high a fever he has. Only then will he accept water, but by that time, he is one sick puppy and cannot even handle water.
When he had chemical hepatitis, he did not want to go to the hospital as the doctor had recommended. Instead I had to wake him up about every two hours to force feed him a liquid diet mostly lemon water or blended veggie soup. He complained bitterly, but when I told him that if he missed a feeding, then I would have to call the ambulance, he acquiesced. He was sick for one month. It was a very trying time.
As soon as he had some liquid in his stomach, then he would sleep like a baby free of pain, but if he refused any liquid for more than two hours, he would really groan and hug his abdomen.
However, I can tell you from experience that the blended veggie soup and the lemon water are better than the liquified cardboard that one gets in the hospital or the IV and the constant bleeping of equipment. Who can sleep there?