In the same vein, does anyone have a passive / portable unit that they can also recommend?
I generally don't drink from our fresh water tank but instead carry a 10 liter military can that I love. I have a slot right beside the fresh water tank where it fits. So from time to time, I need to process another 10 liters as I fill that can back up, partly remotely (i.e., by fetching water from a lake or river).
When I was a backcountry camper, we kept it simple by running all drinking water through our Jetboils, so I never had to look into possible UV or other purification systems. I am a huge tea drinker so about 50% of my off-grid drinking water is still treated by boiling, but I could use something for the other 50%.