Visit www.NJRenewableEnergy.com Rainwater can be used for watering your garden as well as for toilet flushing, laundry washing and bathing. Rainwater stored in food grade HOGs can be used as an emergency potable water supply. Rainwater is soft water, which means that it wont cause a build up of calcium in your plumbing like hard water can. You can drink rainwater as long as your roofing material does not contain toxic materials. You will need to add a first flush diverter to the fine screen …