For our drinking water, I use the heavy duty hoses from RV Water Filter Store, with stainless steel fittings. I coil up the excess on a hose rack next to the rig and keep it out of the dirt. I'll put a white garbage bag over it to keep it protected, too. Since I don't leave my water filtration equipment in the rig over the winter, I clean everything before putting it away and sanitizing is done at home before the start of the season using a diluted bleach solution in the laundry tub.
Last season, was the first time I did the Purogene sanitizing of the system and water tank (was just flushing with a bleach solution before, after flushing the AF out)). Although we don't use the water tank for drinking, I keep 30 gallons in it over the summer for flushing the toilet if the power goes down and the CG's city water pumps are off.