You hop in the shower at his place, and there's shampoo and conditioner for dry/color treated hair [he's seen your roots!
].
He's bald, and doesn't use shampoo and conditioner, so he went out of his way to buy stuff that he thinks will work for your hair type.
Also, if he brings a fresh towel while you're in the shower, and refrains from using the sink/kitchen, so you can hog the hot water.