William Morse wrote:

"Robert Clark" wrote in
There would be significant weight savings if that could be reduced to
5 pounds of hydrogen that had to be carried by each person or
transported to an effected area for a large number of people

In almost all environments save space and maybe the Sahara desert, it is
easier to get water from local sources and purify it

But maybe he plans to fly a zeppelin through the Sahara and throw bodies
over board for ballast. Now he has hydrogen to make water and drive
those fans against his sails...