there could be a water-exchange where you can consume or inject clear water and receive/spend
the execution would need to be heavily regulated (possibly limited to highly trusted actors)
You mean like how you pay your hydro bill to your local water provider for the treated water coming out of your tap?
Consider this: you could get a coinbase card today to pay your water bill with crypto. Now just ask yourself why isn't this more widespread among consumers and up the water provider chain and that should provide some clues for how good/bad of an idea crypto-for-water is. One simple TL;DR answer is that currency to pay for services related to water infrastructure must function like currency, i.e. be liquid, stable, widely accepted, functional in the present (as opposed to some pie in the sky future), etc.
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You mean like how you pay your hydro bill to your local water provider for the treated water coming out of your tap?
Consider this: you could get a coinbase card today to pay your water bill with crypto. Now just ask yourself why isn't this more widespread among consumers and up the water provider chain and that should provide some clues for how good/bad of an idea crypto-for-water is. One simple TL;DR answer is that currency to pay for services related to water infrastructure must function like currency, i.e. be liquid, stable, widely accepted, functional in the present (as opposed to some pie in the sky future), etc.