There's a company that supposedly puts out a portable hydro system, based off of their portable wind power system.
Windlilly and waterlilly.
It looks interesting enough that I went ahead and pre-ordered it, planning on using it for additional ham radio power and whatnot up here in Alaska during field days, camping, hunting, etc.
I say "supposedly" because the damned thing's been on order since July 2020, with nothing but excuses from the company. I'll probably let it ride until August or so of this year, then cancel if it hasn't arrived.
But looking at their system, it would be easy enough to cobble one together. Much depends on your local conditions, it probably would be better if you could design something optimized for your locale. It'd be a fun 3d printer project.