Or at least "the other line I meant to highlight from the Wikipedia article":
There is increasing evidence that the smooth muscle that lines the airways becomes progressively more sensitive to changes that occur as a result of injury to the airways from dehydration.
I had only taken 700ml of water with me; I'd blithely assumed I'd be able to top up at the café and then had Too Much Social Anxiety to ask or even check whether they had a jug out, because that's a thing my brain is definitely Doing at the moment. ... and then on the way back I was desperately thirsty and stole most of A's water, and I am just personally finding it Very Interesting that the thing my body wanted me to do most was More Fluids.