Do you use a water filter when you fill your freshwater tank?

Always. Mostly to keep sediment and contaminants out of the freshwater tank. And I also filter the water out of the faucet that we use for drinking/cooking. But, for the water going into the tank, I use the Camco TastePure Water Filter.

Yep, we double filter too. Filter going in and then again using a Brita filter for drinking and cooking.

Nope. But we don’t use our freshwater tank for drinking, just for showers. We buy our drinking water

We don’t if we fill up at home, but ALWAYS if we fill up at a campground.