I actually bring all of my water in when I hunt versus pumping water locally. If I know there's going to be good clean water around I'll bring my filter just in case I need a few gallons of water. Most of the time it's unknown if there's going to be water close to the road where we hunt and if there is, many of the times it's too turbid to run through a filter. It'd clog it in a matter of gallons. Plus I don't want to spend the time to deal with finding water when hunting and then filtering it and then pumping it into the camper. That means I have to come back to camp during the day to do this and I'm generally not too willing to do this since I'm so far from camp each day. With my set up I can pump 20 gallons of water in less than 10 minutes when I get back to camp, if I need it.
On last year's elk hunt I brought in a bit over 60 gallons of water, split between my camper tanks and my portable cans. We filled the camper's tank and cans at the last town before we headed out so that we didn't have to haul 480+ lbs of water more than about 40 miles. This amount of water allowed me to sit in one spot for over two weeks and be able to shower and wash a load of clothes in a bucket. I dumped a lot of water when I left too.
If you want a pict of my Rule pump set up let me know.