This is reverse osmosis product, a filtered water.
Boiled distilled water is completely different story, it takes lots of time and energy for the vapors to pass thru a serpent turbine, then the inorganic solvents are filtered thru charcoal.
With consumer grade distiller 600W, it takes around 5 hours to distill 1 gallon.
If You got a military grade distiller, like the ones used in submarines, You might do it in less time but it wont cost less.
There is no chance in hell 1 gallon distilled water to cost 1$ unless You live on Mars or Jupiter
Many stores in my area, Chicago, Milwaukee suburbs sell Distilled water for $1 or less. RA water, if doing a refill your own container, is 30 to 40 cents.