"In a few years we'll be staring at new highs in the prices of many natural resources," says Larry Edelson, a specialist in resource-related stocks. In Real Wealth, he looks at two exchange-traded funds focused on food and water.

"Mind you, the U.S. and global economies will not get back to the growth levels we've recently seen, not anytime soon.

"But they don't have to for natural resource prices to soar again. The chief reason they will climb again: Massive, worldwide currency devaluations, especially in the U.S. dollar.

"Moreover, natural resources will get a huge boost from the massive infrastructure spending that is now commencing around the world. I expect two key sectors in particular to get a big boost, almost immediately - agriculture and water.

"What is one thing you can't live without?" asks Brandon Clay and Ron Rowland. "Take away that glass of cool, clean drinking water from your diet, then it's a matter of days before you dehydrate and die." ons

In All Star Investor, they explain, "Water is essential to our survival." And for investors, they add, "Powershares Water Resources Portfolio (ASE: PHO) is a perfect play on the global demand for water technology."

"The essential nature of water is the same for the 6.67 billion people on this planet. With Latin America and Asia entering the modern world at an unprecedented pace, water is becoming even scarcer.

"Improving diets and growing industry have pushed this diminishing resource further from the reach of many people. Yes, people are still drinking water, but at what cost?

"Water covers most of our planet. Still, less than 2% is fresh water. That makes water a limited resource. Consumption is growing with 6,000 cubic meters per inhabitant used every year. That's the equivalent of draining Lake Superior – the biggest lake in the world – twice. Since the water cycle is not replenishing growing demand, water sources are being depleted.