My dad has had pneumonia twice in a year and almost died both times. He and my mom live alone in their own home. He is very weak and does not like to drink much. He hates water, flavored water, tea, lemonade, Gatorade etc. he is getting dehydrated again and I don't know what to give him to drink. Any suggestions? I don't want to see him go back in the hospital again. He is 88.