"For him to be a viable non-technical cofounder, he'd need to stop being a water consultant, and start being a cofounder. " This part I completely agree with y

"For him to be a viable non-technical cofounder, he'd need to stop being a water consultant, and start being a cofounder. " This part I completely agree with you. If you're splitting equality (relatively) equally. He should be as committed as you are, if he's not, than you need to be compensated extra for it.