When I was first starting to RV, I would spend the first 2 nights in a fhu. That way I had plenty time to dewinterize , sanitize and get everything right by following my checklist. I got bottled water for drinking and cooking back then. I still do but bottle the water at home since I have a filter.
2016 Surveyor 201RBD
2006 Jeep Commander 5.7 Hemi
2017- 27 days,2018- 100 days, 2019- 35 days