Pharmgeek ... You don't need to empty your fresh water tank and waste all that good water if you use your rig reasonably often. We keep our relatively small tank full, including between our frequent trips. In our arid climate I do not want anything to dry out completely. And, because it has a small capacity, we go through a full tank fairly quickly. We do add a little bleach or fresh water treatment solution (which you can find at Camping World, etc) from time to time, just to make sure the water stays fresh, especially if the water we add is from a non-city (as in non-chlorinated) source. We cook with and drink water from our fresh water tank and have never had an issue.
Often — just to keep the water fresh and "recycled" — even when we have a water hookup available at a campsite, we will use the water from the fresh water tank by using the water pump. Then fill it when it gets low from the campsite's water source. This keeps the on-board supply fresh.
TB & Greg and Abbey Schnauzer
AirForums #21900 . Membership Chair, 4CUnit #3954
Travel Log: AZBambi...On the Road Again