I routinely do 65--85 miles each day on both Saturdays and Sundays here near Tampa almost every weekend. Here's what I eat and drink:
6:00--6:30 a.m. > bagel with creme cheese. Two 10 oz. glasses of water. Two 6 oz. cups of coffee
7:00--leave home. Ride to where team meets. 15 mile "warm-up".
8:00--arrive at team rendezvous. drink 8 oz. grape juice.
8:00--9:30 drink 1 bottle of gatorade (28 oz.) and 1/2 bottle of water. 30 miles paceline training at approx. 26 mph.
9:30--arrive at rest stop. drink 8 oz. V-8 juice and 8 oz. water. refill water bottles. eat 1 power bar or power gel.
9:40--11:00 drink 2 bottles of water. 25 miles paceline training at approx. 26 mph.
11:00--last rest stop. drink 28 oz. Coke. Head home. 5 miles "cool down".
11:30--arrive home. drink 18 oz. orange juice with powdered milk. drink 16 oz. water. drink approx. 6 oz. water every hour for the rest of the day.
With all that liquid consumed, I find that I'm still down a couple of pounds when I get home. It's so hot in Florida this time of year that it's virtually impossible to drink enough to keep up with sweat loss.
Bob