also the point that it's set in something like medieval times so there wouldn't have been water is moot considering sansa and joffrey respectively are children of some of the wealthiest and most powerful families in the entire continent. i am pretty sure they can afford to purify / buy pure water
Sure. I imagine in Winterfell the kids mostly drank fruit juice or spring water. (Since they drank wine rarely.) Though Sansa and Joffrey were out wandering in the middle of nowhere, and only had what they brought with them and what Joffrey forced local people to give them.
That whole incident is totally bizarre btw. Joffrey, a prince and heir to the throne, goes wandering through the Riverlands with the daughter of the Hand of the King? Without any soldiers, deliberately without his bodyguard? Cersei must have been beside herself when she figured that bit out. (I mean, consider how freaked out Maekar got when two of his sons vanished in THK, and there at least one of them was an adult and they were minor princes to boot.)
So despite GRRM's claims to realism, honestly that whole thing is a literary setup that's really really obviously so. But... it is what it is.
