I take it you mean this water will still be caried from the spigot to the camper in a 5 gallon container and not by hose directly from the spigot.
The latter means you could buy a filter system from Home Depot that cleans all the bugs and sediments out and the direct pressure into the camper.
The hand carry option means that if you are not near the spigot all the time you would have to lug the filtration system with you each time to hook up - else others will use (and possibly take) it. Both will mean you end up with clean - I would still boil for direct use.
Even with this, I would regularly sanitize my water system with bleach - lots of hook up issues and contamination oppertunities.
There are chemical additives you can add to the tank water to kill of harmful bugs - I do not recommend them - bromine additives are what we use aboard ship in foreing ports.
Michael & Tina with Layla and Preston BZ
The family has grown.
2003 22' INTERNATIONAL CCD