Sodium and fat. You want sodium both becuase you are dehydrated and need it, but also because it makes you want to drink more water, which you really need. Fat because you need a solid meal after probably not eating while drunk, but also something that tastes good enough for you to want to eat it even if your stomach feels queasy (comfort food tends to be fatty).
As for bananas and soup, people associate bananas with potassium, which you also lost while peeing/sweating too much, and soup is mostly water, which you also need after that.
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