Tammy, I live in the desert and on a well system. The best part of my well is no electricity to pump it. But it has gone dry in years past and you just do not water. Most plants will live longer than you think without additional watering. They will look ratty and not what you envisioned when you planted them but they will survive a season or two on whatever they can glean. And I have had many cactus die to drought.
Water conservation is a lifestyle. My sinks and toilets go into the septic system. But my washer and bathtubs go into a separate pipe that waters my trees near my house. When I have a drink and the ice is left melting, it goes outside on plants. My kids don't always finish a can of soda or a bottled water, it goes outside and dumped on its way to the recycle cans. When I defrost a freezer and there is ice chunks, they go on my plants. Mopping floors, plants get the pail. Any rain water runoff is redirected where it will do the most good.
It takes some extra work but not much when you have a system going. And the biggest thing is that gray water. It is really a fairly simple project in a manufactured home. And has the most impact.