I was always a bit disbelieving about whether cafes on the SWCP would have been likely as a rule not to charge for hot water.
Surely the norm would be to be fine with giving an extra pot of hot water to someone who's already paid for a pot of tea (ie, you're providing a free refill at minimal expense), but not to provide free boiling water to non-customers, especially in a busy period where they're taking up a table paying customers could be using?
I was mildly tickled by an early scene in the film where they go to a tearoom, and order one cream tea and an extra pot of hot water (so far so normal), though the waitress looks weirdly puzzled by being asked for an extra pot of hot water, which is a quite normal thing in a tearoom, I'd have said. Certainly my thrifty aunts always would.
But then, promptly on having both teapots put down in front of them, GA or JI takes out one of their own teabags from their rucksack and puts it into the pot of hot water with a surreptitious air, when surely that's not what you'd do if you were really on your uppers and carrying all your food and drink with you. You'd wait a minute or two till the tea in the actual pot of tea was at the strength you like, then you would remove the teabag/s from that one and put them into the plain hot water pot, thereby not using any of your own tea, and you'd drink the original teapot while the second one brewed.
(I mean, OK, the implication might be that this tearoom only uses looseleaf, not bags, but it did make me wonder about the limitations of films about supposed homelessness being made by people who've always been prosperous.)
Also, that was a gigantic cream tea for one that GA tucks into while JI tells the people at the neighbouring table that they're homeless, and they go from friendly to icy in a nanosecond! Maybe it's just that GA is a small, thin woman with a narrow face and hands, but that scone looked enormous!