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I've never tried it, but I've been told that mixing a little bit of 7-Up with the water works really well.

I've heard of adding bleach to the water to kill any malicious bacteria in there though I imagine this would be a big green no-no so I've never tried it personally.
some bouquets I've bought or received as gifts come with little packets to mix into the water. I wonder what exactly is in those...

a wee spot of bleach w daisies,

a shiny penny with tulips or gerberas will make them last way longer!

and adding any sort of sugar to the water.

Bleach will eventually evaporate into the air leaving clean water. Although the production of bleach is not green, the end results can be non-toxic

@m-prove, if I had to guess I'd say sugar, citric acid and maybe some antibacterial stuff. My gardening prof said to mix in some sugar, some lemon juice (or skip both and go with lemon-lime soda) and a quarter tsp of bleach to make them last.

Also keep 'em out of direct sunlight.

I find that my flowers last longer if I cut the stems shorter. So, low-profile arrangements last longer than tall ones.

Also, I forget where I saw it (BHG? Consumer Reports?), but I remember reading a comparison of all the different ways of making cut flowers last longer (e.g., bleach, sugar, those pre-made packets).

I dont know, but I love that fruit bowl!