I have been living full time in my RV for going on three years now, and i am happy with my lifestyle.
After reading your post, i thought i would make a suggestion, instead of stockpiling water, which is costly, not only in terms of fuel to carry it, but also in terms of the limited space you have in an RV, i suggest that you purchase a reverse osmosis water filtration unit, this will enable you to have clean water from any source.