The easy Heloise way is to hang them upside down somewhere that has air circulation, but is not hot or in sunlight. I string dental floss around the stems and have a few cup hooks in the ceiling to hang them up on. Depending on the flowers, it may take a week or two, or longer. If it’s a big bouquet, you should either take it apart or stuff some paper towels in between the flowers to help air circulation.
I’ve also had luck with just putting the bouquet or a dozen roses in a big vase, setting them on a table and letting them dry. They keep the color, and as long as they stay upright, they come out fine!
P.S.: For only a few flowers (roses are perfect), press them between paper towels or newspaper, using a heavy book.
After a sudden stop, the cane hit me. Danger realized. The cane now resides in the rear seat. It is more trouble to retrieve, but is no longer a flying weapon!