Indeed, you have touched on one of the advantages of a totally solar hydrogen world, one of the natural positive side effects would be transportation of water.

So it would make sense to make it a simple requirement of fuel cell and vehicle manufacturers that their products should ensure that the water is respected and should be practically collectible and drinkable.

That might add a little to their manufacturing costs, but the advantage gained is huge, and as you might see later, there will actually be no limit to what we might spend on developments.

Personally I believe we are heading towards community oriented, decentralised 100% solar hydrogen in all places, and I believe it will happen very quick when free money is issued reflecting the already received Joules from solar, which have not yet been reflected by issue of money.

I've written much more on this, I call it "Kardshev Money". I believe the absence of it, in the presence of tens of GigaJoules per second, and still scaling up solar energy, in every developed country, it is inevitable free money will have to be issued on it, to stop the current spiral of inflation, which will otherwise end with devaluation of all fiat currencies.

https://eric-bott.medium.com/the-fuel-tree-5ef66be03c4

https://eric-bott.medium.com/kardashev-money-is-the-future-8b8ad772772