From harvesting rainwater in a rain barrel to composting your kitchen and yard waste in a compost bin, you can greatly increase your self-reliance by undertaking a few simple DIY projects. Read more: http://www.motherearthnews.com/do-it-yourself/how-to-make-a-rain-barrel
All plants need water to survive. However, like plants that require more water, there are plants that grow in a lack of water. They are the best drought tolerant plants and can live without water for a long time.