The theory: Increases the acidity of the water, helping it move up the stem.Day 1: One 325-milligram Bayer coated tablet is dropped into the water.Day 4: Drooping and sad, these tulips don't look as if they'll last much longer. Another tablet goes in the water.Day 7: Yikes! More than half the petals have fallen off. (See photo, left.)The verdict: Painful. An aspirin a day may keep the doctor away, but not the florist.Watch this quick video for more ways to extend the life of fresh flowers.