I must pass on the salt/water idea to him; he would probably try it. He's been so busy lately and I need to have a chat with him.
He mainly drinks water, but I know that he said that he has not been eating much fruit, so I suggested that he eat lots of juicy fruits to see if that would help. Once in a while to be sociable, he'll have a coffee but, rarely, and I guess when he goes out on the weekend, he has beer, maybe a scotch if it's a business 'do'.
He is interested in maintaining his health and this constant dehydration concerns him; it was not a problem when he was living up here.
Thanks for the info. I should rehydrate my hubby -- he dislikes water! And, enjoys too much coffee -- stopped bringing it into the house to see if that could help with his having fewer cups. :)