If you must...

If you must gamble (and yes, investing in stocks is a gamble, and something I don't recommend to clients since most are unfit investors) my next call is buying water stocks. Living without oil will be a struggle, but we will survive future oil crises. But living without water will lead to death. Not only do we need it to hydrate ourselves, but we also need water for our crops, and almost every product we consume. For instance, It takes thousands of gallons of water just to make one pair of jeans. It obviously takes a lot more water to manufacture autos, semiconductors, toasters, etc. I'm not at liberty to recommend specific stocks (for legal and other reasons), but you can do your own research on that. Just tread carefully, and only invest if you can afford to lose some or all of your investment. Hence, for most people whose net worth is under $5 million, I do recommend applying Missed Fortune strategies developed by Doug Andrew. It's a safe, conservative strategy to provide liquidity, safety of principle, and earn a competitive, tax-advantaged rate of return.