How come my roses aren't opening?

I got them 2 days ago.

I diagonally cut about 2 inches of the stems off
I removed the guard petals.
I put them in water with the plant food in it.
I changed the water daily and added peroxide to help the water not get cloudy.
I removed the leaves that are touching the water.

They are starting to look a bit shrived and it only been a couple days
😩

🥀