Did you get flowers for Valentine's Day? Want them to last longer? Besides aspirin-in-water hack, here are a few other hacks to help them to stay fresh longer. 1) First, hairspray not only keeps your hairstyle looking fresh longer, but a spritz of it can also do the same for your fresh cut flowers. 2) Another trick is to add a teaspoon of sugar and a few drops of vodka (or clear soda like Sprite) to reduce bacteria growth. 3) You can also try bleach. Just a fourth of a teaspoon is all you need. 4) Try combining a copper penny with a cube of sugar. The copper acts as an acidifier to deter bacteria growth.