Enjoy this 7:01 video from Camping World on Apex-brand line of drinking water safe hoses, which come in two diameters and lengths ranging from 4 feet to 75 feet. And that the video is hosted by Mark Polk of RV Education 101 fame doesn't hurt, either.
We keep two coils of drinking water safe hoses on our camper. Each are 25 feet in length. I figure if 50 feet of hose isn't long enough, then the campground probably has plenty of other issues as well.