Draco took in Harry, the chair, the bottle, and the juice with a smirk and a raised eyebrow. He wasn't surprised to find Potter drinking, he would have been more surprised if he wasn't. Potter seemed to have two modes these days, drinking or driven. He got it, sort of, even if he didn't think it was very good for him.
"Juice. Oh joy." He walked over to the other chair and poured himself into it, looking over the juice with an amused sort of fondness. He doubted the juice had just been lying around, so Harry must have requested it specifically for him from the house elves. He tried not to read too much into that.
"I hope you told the house elves that I only eat the finest foods imported from France. Even at the end of the world we do have to keep up our standards."