Keep your fresh cut arrangement at a cool room temperature, out of direct sunlight.
To enjoy the arrangement to its fullest potential, you may change the water every other day: Carefully tip the arrangement over the sink, pouring out the water. Grasp all the stems together and recut the bottom of each stem at an angle with scissors or clippers. Place the arrangement back into the vase and refill with fresh water.
When the flowers have retired, you may bring back the empty vase and purchase a fresh design of your choice.