We always travel will full fresh water, just like I always take the generator, even when we plan to have hook ups. Just my anal retentiveness, I think what if there is a water issue at the park, what if there is an electrical problem or we have to overnight somewhere like a truck stop when it is hot. The extra weight really doesn't bother me either.
Goody Two Shoes and the Filthy Beast
2008 Chevy Silverado 2500HD
Duramax and Allison 6 speed
2012 Wildcat 282RKX
You can't make things idiot proof, you can only make them idiot resistant.