The programming talent myth

Crafted stone tools go back 1.5 Mya+. If you can make a finely-crafted hand-axe, you can make a scraper. That's enough technology to make a water bag from animal skin and connectivity tissue: scrape a piece of skin clean, grease and cure it, tie a neck together with dried connective tissues. Won't be water-tight, but it's something.

Genetic studies of human lice suggest clothing was worn at least 100 kya ago. If you can make clothes, you can definitely make waterbags.

So the tooling technology needed to make waterbags exists 1.5 Mya, and we were making more sophisticated (and probably more abstract in function, given the hot conditions) items by 100 kya. It seems like to me.