What kind of drinks do Gatsby, Jordan, Tom, and Daisy have at the hotel?

From the text:

The notion originated with Daisy’s suggestion that we hire five bathrooms and take cold baths, and then assumed more tangible form as ‘a place to have a mint julep.’ Each of us said over and over that it was a ‘crazy idea’—we all talked at once to a baffled clerk and thought, or pretended to think, that we were being very funny….