I bring my shampoo with me when I travel.
I use the hotel shampoo.
I use a shampoo alternative like no 'poo at home, and I take it with me when I travel.
I use a shampoo alternative at home, but when I travel I take a little bottle of shampoo.
I use a shampoo alternative at home, but when I travel I use the little hotel bottles.
I bring shampoo, but I sniff the hotel shampoo and try it if it smells good.
I don't have hair, and my scalp doesn't need special washing products.
I don't travel far enough that this is a concern given how often I wash my hair.
Something else I will say in the comments.
Now fiddle_dragon says five more inches of snow at home this afternoon/early evening, and the Northwest website is being unhelpful. Well. We will go to the airport and hope for the best, and we have money, cell phones, books, and fruit leather. It's like we've done this before or something.