Every day millions of people don't have clean water because of poor plumbing or not having plumbing and walking to the closest pond. So here is a link to where we can use grey water which is excess water from taking a shower or washing your hands.
So we can use a bucket or a container when we are waiting for the water to warm-up for our shower or when we rinse fruit or wash our hands. Then we can use that excess water and water our plants and it cuts down your utility bill because you don't have all that waste water in your tank.
http://1800recycling.com/2010/10/blog-action-day-collect-greywater/