I bring a thermos. Cheap, and I prefer tea (which isn't very good at most places)
But not a great spot for making money Ubering. I was there earlier and there were around 20 cars, and only a couple small planes arriving.
Besides, the queue system doesn't always work well. I've stopped just to use the bathroom, and got an airport ping, despite there were a dozen people already waiting there. Also had the opposite happen to me, when I tried waiting the last time. There were only 3 cars in the lot when I arrived, but about 8 cars went out before I got a ping (cars that had arrived long after me).