As for the water bottle example, you are bothered by details, most variables of btc aren't linked to deep physical limitations. The current btc is not suitable for such a transaction ofc, but that's irrelevant to the possibilities of blockchain.
Really, be it a water bottle or a Playstation 5, or a Ford F-Series, the physical goods market evade cryptos and that's the only challenge for it's growth. Humans need fuel to live, and they but it with fiat. And the reason is political otherwise they would have a plethoric amount of entrepreneurs willing to accept blockchain powered money for their products. Elon Musk tried it for a time even, there's little doubt why he dropped the opportunity.
West Africans and Hindus getting access to internet won't make a huge difference also c'mon.