Drooping Sunflowers

I bought some sunflowers from Trader Joe's a few days ago, intending to paint them. I trimmed the stems and put them in a vase. Within a day they had wilted. I couldn't figure it out. The vase was opaque with a pretty narrow opening, so I didn't notice that I had forgot to add any water. So, yeah....no wonder. Anyway, that's why they are hanging down like this. I decided to paint them anyway...