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The typical grain mixture for bourbon, known as the mash bill, is a minimum of 51% corn, with the remainder being rye, wheat, malted barley, or some combination of these. A mash bill that contains wheat instead of rye produces what is known as a wheated bourbon. The grain is ground and mixed with water.
Distilleries may have used barrels available. Bourbon is whiskey, with a mash bill of at least 51% corn, made in the United States and aged in charred, new oak barrels. It's fine if the metal banding on the barrel is rusty, but the wood should not be overly deteriorated.