We've been in the same place since last August (except for a two week trip to Quartzsite in Dec/Jan).
We keep the tank full all the time while here, so if there's a problem with the parks water system (not unheard of), we have water. Every 1-1/2 to 2 weeks we use the water from the tank for a few days to cycle it, then we go back to park water.
During the winter, when temps got below freezing we used the water from the tank to avoid freezing up. The tank is a lot less likely to freeze than a water hose, even when the faucet and pipe are heat wrapped. We never froze the whole winter while neighbors all around us had hoses bursting or frozen solid. That's even during the time we had over 11 days of temps that never got above 28 degrees. We are very pleased with the MS's insulation and "heated" compartment.
MobileSuites '06 36TK3 #3151
Fulltimer Aug. '06, Hit the Road Sept. '07