Unlike most cut flowers, tulips keep growing in the vase. Plus, as they grow taller often up to an inch they tend to bend toward sources of light. Place the wrapped bunch upright in a container holding cool water deep enough to submerge the exposed stems. Leave in a cool place for an hour or two. Most bulb flowers like cut flower food in the water.
Tulips are the exception.
They prefer their water straight. Closed tulip buds will open up in the first few days in the vase. They will last a good week or more, with some help. Temperature is important. For longest flower life, keep the tulips in a cool spot in the room.