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NEW YORK ( TheStreet) -- Opportunities only exist for those who do the homework, Jim Cramer told his "Mad Money" TV show viewers Wednesday. He said those investors who are just simply following the Federal Reserve have had a hard time making money in this market, but those with discipline have had a very good month. Cramer said biotech remains a red-hot bull market, with Celgene ( CELG) up 89% for the year and others, such as Trius Therapeutics ( TSRX), getting a takeover bid. Shares of Trius are up 116% since Cramer first recommended it. Investors are also pouring money into spirits, noted Cramer, with Anheuser-Busch InBev ( BUD), Diageo ( DEO) and Boston Beer ( SAM) all posting solid gains. Cramer said investors could also follow hedge fund managers with investments such as Air Products ( APD) or Herbalife ( HLF). His own charitable trust,