Haha, I've been there too! Soaking it in ice water is a lifesaver. The lettuce I bought in Seoul wilted after just two days. My friend taught me this trick, and now I do it every time. It keeps it fresh for a long time.

Oh no, I just bought a salad and I'm so sad! Thank you for sharing this tip! I'll try following your method; these things tend to wilt very quickly.