Indeed, water is an issue, its a stakeholder concern which is addressed in the system solution of Domestic and community based solar hydrogen, with an economy of permanent solar indexed stimulus.
The basic strategy of it is to over-equip all installations so everyone has too much energy, more than they/we can use. In this scenario, given hydrogen generation capability to dump all excess energy into hydrogen, and given the more of that we do, the higher the financial stipend there will be for all, we will see increasing bulk of stored hydrogen. Its a relatively simple conversion to convert all EV and ICE vehicles to use hydrogen. So there would be a market for excess hydrogen, including hydrogen for aerospace.
This might at first sound like bad news for water, because creation of hydrogen consumes water but actually this is an advantage rather than disadvantage because the water comes back out in vehicle exhausts. Hence why requirements should be put on all manufacturers of vehicles and consumers of hydrogen to preserve the output water as drinkable, because it is very pure water that comes back out of the water-to-hydrogen and back cycle, regardless of purity at input, its actually a kind of free filtration and circulation of water, which would happen as a side effect of hydrogen being widely used in transportation.
The other exhaust output is oxygen, which again helps purifiy and circulate clean air.
This is the universe nudging us, to say "Use hydrogen", imho. There are many more god-signs associated with it, all enabled when we start to generate it from solar, because like this, its fuel which has even higher value in markets than fossil fuels, given creating it from solar actually lowers entropy, cooling the planet. A kg of hydrogen is 33KWhrs of potential heating energy removed from the sun, regardless of efficiency of conversion.
Hence why I think the water concern is covered, but its good to keep it a high priority concern, to make sure it gets reflected by suitable requirements on fuel cell and vehicle manufacturers, to keep exhaust water drinkable.
Sorry long reply again but I hope it helps to see how use of solar hydrogen would have beneficial effects on water.
