I measure (right in front of him) 8 cups of water into a pitcher. I told him that once the water is gone from the pitcher, then he's had plenty of water for that day. Does not matter what glass you pour the water into as long as it's from that pitcher. His occupational therapist told him the same thing - he doesn't believe her. She tried to explain that you get your daily water from water as well as foods. He didn't believe her.
In his defense, when he was in rehab after his fall, he did experience severe dehydration and was sent to the emergency room for fluids (the doctor noticed he was unresponsive when he was doing rounds in the morning). Naturally, he is extremely fearful of it happening again. He's been living with us for over 2 months and is eating and drinking normally. He's very alert and his overall physical apperance has improved dramatically. His blood pressure is perfect. I scheduled his annual physical for next week with his primary. I'm hoping the doctor can reassure him he's ok.
