Here is some info on caring for roses that I got from a flower website.
It says what to do for wilted flowers at the end.

1. Trim each stem at a diagonal under water to the recommended display height of your container or vase. Don’t be afraid to cut!
2. Remove all foliage that will fall below the water line. Remove the “guard petal” from each rose – this is the outermost petal left on the bud.
3. Fill your container or vase with warm water and add flower food as directed.
4. Arrange roses and keep display away from hot or cold drafts and direct sunlight.
5. IMPORTANT! Add fresh water daily and recut stems every other day. Roses are thirsty flowers.
If a rose wilts or droops prematurely, recut the stem and submerge the entire rose in cool water, straightening the stem and head. After an hour or so, remove from water and place it back in the vase.