I'm enjoying the comments about the "bad" water in Elkhart. Funny story - I grew up in Elkhart County (that's not the funny part) and went to college at Purdue (that's also not the funny part). I had grown so used to the exceptionally hard water from the well on our farm that I actually missed it when I went to college! So every few weeks when I'd come home, I would fill up plastic jugs and take it back to college with me. I eventually got used to city water, less hard, whatever, and much prefer it today. So, don't fear the water - one tank isn't going to hurt your system by any means, although it might taste funny to you if you drink it out of the tap (which we never do in our RV anyway).
Also with regard to Elkhart County - don't fear traveling there this time of year. The county in particular, and the region in general, is very adept at handling the weather they receive this time of year. I would MUCH prefer driving on an Elkhart Country road in a Feb snowstorm over driving in Nashville after a light dusting any day. Seriously!