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According to The Sun, the singer wants two crates of the 40% whiskey backstage at the festival.
"Organisers have heard Miss Winehouse has ordered in an extremely large amount of Jack Daniel's," commented a source.
"In fact, a ridiculous amount that she and her team could not possibly consume during their short stay.
"Everyone is really excited about getting Amy to perform here, and naturally there are now fears she is planning something wild."
The insider added: "With Amy's record this can mean failure to perform or giving a shambolic performance. Whiskey is better than heroin - but not 48 bottles of the stuff."
Other acts playing the Isle Of Wight event include My Bloody Valentine, Hot Chip, Paul Heaton, Will Young, CSS and The Sugarhill Gang.
