Iced tea?

I have drank (drunk?) over 2 gallons of water today. When I lived in AZ 3-4 gallons a day was normal. My dad...he used to love iced tea. He never, other then when he fell and broke his hip, said he wanted to go to the ER. One day he told my mom that he wanted to go o the ER. Was middle of the summer in Jersey...temperature and humidity were both in the 80's. He was just dehydrated. Few days later....he was back at the ER again...dehydrated. My mother called me up, a bit concerned. I asked if he was drinking enough fluids...she said he was drinking a gallon of iced tea a day....the kind you mix the powder in the water. He failed to tell anyone that he was putting almost 2 cups of sugar in with the mix and water. Third trip to the ER he ended up seeing the same doc he did the first 2 trips...my mother mentioned the sugar...lets just say my parents got a 20 minute lecture from the ER doc.....my dad started drinking just water afterwards....