Only time can do that. Showers and coffee may make a person feel more awake, but they don't reduce drunkeness. Body weight and the amount of foods or liquids in the stomach affect how quickly the alcohol is absorbed in the blood system, but not the amount absorbed. All the alcohol still gets in to the blood. Eating will slow down the alcohol absorption, but it won't prevent those who drink too much from getting intoxicated.
Most motorcyclists believe they can have a few drinks without affecting their riding skill .
But even at moderately low levels, alcohol can affect vision, coordination and ability to react - skills critical to safe motorcycling. As shown above, most of the vital riding skills begin to deteriorate after only one drink. Three to four drinks cause further impairment and loss of efficiency, and after about five drinks the motorcyclist's coordination begins to fail. The study showed that injury severity increased for those riders drinking alcohol. Almost half of the fatal accidents studied involved riders who had been drinking.