need 4 pennies. 
"So how does a plastic bag filled with water drive flies away you may ask? Some have said it magnifies the pennies resembling another insect’s eyes, scaring the fly away, while others say the clear liquid looks like the surface of a body of water, which the flies perceive as a place they don’t want to land. The best explanation is simple light refraction going through the bag of water that confuses the housefly. If you will remember your biology from days in school, a housefly has large complex eyes made up of thousands of simple eyes that don’t move or focus. The fly bases his movement by light and the refracted light coming through the water in the plastic bag confuses the fly causing him to move on to a place that is easier on the eyes."
Bag of 4 pennies and water - Fly Repellant
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