No problem finding Diet Coke in the groceries,...sometimes you had to stop at a couple. Someone always had them. I ran into problems at several restaurants offering only regular coke,..and snorkle tours offer only regular softdrinks and the Bagged water.My Husband was thrilled to find Mountain Dew on the island. He's a real DEW freak and we have never found it in the Virgins or Mexico/Cozumel, or anywhere else we have traveled. No Diet Dew.