I find the bundles of sugar or sweeteners in sports drinks a bit much. Dioralyte, while not as tasty, does a much better job of replacing salts and minerals without the sugar hit.
I suppose ultimately you can't cure a hangover, only time can do that. But you can make that time more comfortable...
Don't sleep in too long. Get up, shower, light breakfast of blueberries and a couple of spoons of porridge. Fresh air. Lots and lots of water. Try and find a light job to do like mowing the lawn or fixing something, I find it distracts me from the worst of it. Then a ploughmans lunch. 2 bottles...