Water is something that's been taken for granted ever since the time of the first man. We all assumed it would be there whenever we wanted. Not True. The use of rain barrels is one the easiest ways to conserve water.
I remember visiting my grandparents when I was little. They made use of rain water barrels decades ago. Part of the reason they saved water was due the hard economic times they grew up in and part was due to the fact that clothes washed in rain water kept them very soft. My grandmother also used the rain water to wash her hair. It always smelled good and was very soft to the touch. Her barrel was the old wooden type.
Rain harvesting is vital if the world is going to survive. Rain forests are the world's oldest living ecosystem. They currently cover only 6% of the earth's surface but contain more that 1/2 of the world's plant and animal specimens which provide both food and medical products. A rain forest is described as a tall dense jungle. The reason it's called a "rain" forest is because of the high amount of rain it gets each year (usually between 68-78"). The climate is very hot and humid so the plants and animals that live there learn to adapt to the climate.
Start thinking "water conservation" and look for rain barrels for sale to get started. Time's wasting so start now. Water conservation is vital and capturing rain water is necessary.