I have a "multi-prong" water plan. Every 6 months, all stored water is dumped and the containers refilled. Potable water consists of a 55 gal drum and 2 liter soda bottles that have been cleaned & refilled as they were emptied of soda. After Dec 1st, each year, I dump the "extra" 2 liter bottles (keeping a certain number always) and recycle the jugs. Starting May 1st of each year, I again start saving empty soda jugs and fill them with water. IRT non-potable water, I have quite a few 5 gal jugs that hold this water & I refresh them every 6 months when I change out the potable water. IRT sewage, I have a porta-potty that is filled from the non-potable water jugs and I will dump the filled porta-potty reservoir down the toilet, as long as the sewage lines continue to flow. When the sewage lines stop flowing, I'll have to resort to the storm drain in the front of my home for my dumping ground. This is not the best of plans but it is the most realistic plan available.

The best luck is what you make yourself!