You look good mate, should dry out nicely for your next show if you don't stop water so early. I think it would be hard for James to advise you on how many carbs to take in as he doesn't know how you respond! I recon you should continue water until the night before your show then just sip up until you get on stage.
On the saturday I drank just over 8 litres up until about 8pm.. I then sipped on water and had some dry white wine at 11pm then went to bed. When I woke up for the toilet I had a sip of water. It worked really well and I came in alot better than when I cut water out at 6pm sat evening before the UKBFF.. I came in fuller and in better condition!
