Well, there are soooooo many methods
Even More Alcohol
So called EMA syndrome
Had a friend who often drank up 3/4 of wine bottle after hangover and it really helped him. Sounds funny, but it works SOMETIMES. Tried it once or twice myself... but then you risk one day you wake a up like a bum, sleeping in a trash container wondering what the fuck was goin' on last 4 years
Water
One of the best remedies. Body is dehydrated, needs water badly
A small disadvantage: can make you throw up and besides not all people can even drink pure water
Coffe
Works with some people, but generally it gives you just a short bump, then it gets even worse. Coffe dehydrades body just as any drink that contains sugar or alcohol.
Isotonic drinks
Really helps. They contain minerals and other stuff that help body to absorb water. Most of them taste like a piss tough. Be aware, Redbull is NOT a typical isotonic drink, contains taurin, coffein and lot's of suggar. Energetic drinks are like coffe: BUMP, let's do this and let's do that, but then you may get even worse.
Pills.
Heard of, never tested. And I don't even plan to do so. I I wanted any more synthetics I woud take rather acid I guess
Sex.
One of the BEST ways to get through it. Provided the chick is still in the bed and you remember at LEAST her name