Note that having it hooked up to water would imply that you're using city water and not your fresh water tank. It's only when you're not hooked up to city water that you use the water pump and fresh water tank (if you want water).
I would keep some water in the fresh water tank, just so you have access to some water while on the road - or otherwise not hooked up to city water. That way, if you want to use the bathroom while on the road, you can still flush and wash your hands, etc.
You don't have to keep very much. I keep mine about 1/4 full (give or take).
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2022 Cedar Creek Champagne 38EL - "Big Bertha"
2019 GMC Sierra 3500 Denali HD 6.6L Duramax TD, CC, 4WD, DRW - "Mr. Beefy"
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