While you’re reading this, I’m on my way back from the California desert. I’m actually writing it before I depart, from my home in Massachusetts where there’s plenty of water. But going to the desert, where water is taken for granted, always makes me reflect on how profligate we are with water, and how sorry we’ll be about that a couple of decades down the road.

Yes, I believe that within my children’s lifetime, the price of water will soar, its availability will decrease, and we’ll have a serious resource crisis. Actually more serious than the oil crisis. There are plenty of energy substitutes for oil; we can easily generate the power we need from clean, renewable sources: sun, wind, water, and especially a complete rethinking of what is possible in the way of energy conservation. Reading people like Amory Lovins makes me aware that as a society, we could easily reduce our energy consumption by 80 percent or so, without any negative impact on quality of life.

Water is not nearly as replaceable as oil. Human beings, other animals, and all the plants we rely on directly or indirectly for food need sources of clean water, and the supply is not infinite. So it’s incumbent on us not to squander the good water we have, through waste or pollution.

The good news: like oil, water use could be sharply curtailed without any negative impact on lifestyle. I estimate that I probably use no more than 1/10 as much water as the average American–and I’ve met people who use 1/10 as much as I do. I’m not suggesting you collect buckets of rainwater and use them to flush your toilet, as one woman I talked to recently is doing. But I do suggest you look at the obvious places where you’re running water harder and longer than you need to.

Here’s one simple, totally painless example: if you’re like most Americans, when you brush your teeth, you turn the water on (often full-force) and let it run for three minutes or so while you brush. When I brush my teeth, I do it like this: Wet the toothbrush with a small trickle of water, and then turn the water off! Turn it back on to rinse the toothpaste off the brush at the end. So instead of several gallons each time, I consume a couple of ounces of water.

Want to know more? 28 of the 111 conservation tips (yeah, I snuck in a bonus tip) in my e-book, Painless Green: 110 Tips to Help the Environment, Lower Your Carbon Footprint, Cut Your Budget, and Improve Your Quality of Life-With No Negative Impact on Your Lifestyle, are about saving water.