You could tell him your not thirsty. That might work. Oh my the clothing thing my dad asked my mom something along those lines once. Its best to role it off as him being senile. Men aren't really aware of their surroundings as they like to think, they may know the big picture but they don't pay attention to details. I simply lay it on the lines that I'm not a child and if I am thirsty I will simply take care of myself. Is your husband afraid of dehydration because if that seriously is an issue than I can't blame him.