To extend the life of your bouquet, just follow these simple rules: 

1. Trim stems diagonally before placing in clean, lukewarm water.
2. Remove leaves below the waterline.
3. Change water every 2 days and recut stems.
4. Add flower food or a mix of sugar, lemon juice, and a drop of bleach.
5. Keep away from heat, direct sunlight, and ripening fruit.