I used this recipe but omitted the mescal because I didn't happen to have any. Remarkably, I did happen to have Hawaiian smoke salt. My brother and sister-in-law gave me a selection of gourmet salts as a gift sometime back from Spice Station which purveys all kinds of amazing salts, spices, sugars, teas and chiles. I don't think I've ever felt so triumphant to have a recipe ingredient — Oh? Hawaiian smoke salt? Of course I have Hawaiian smoke salt. I think it would be fun to pick out some crazy salt flavors to have around, and the smoke salt is really interesting and strongly flavored, but I also think regular coarse salt would work just fine.
I really enjoyed trying out nopal in this drink. A lot of other recipes I came across extolled the benefits of nopal smoothies, which sound healthy and refreshing, so maybe that's next!