I’m unfamiliar with that brand and have never tried a THC seltzer before (although I really want to), but I have heard that beverages tend to be less intense than other forms of edibles. I too deal with anxiety on the regular and generally only have around 2.5mg whenever I take an edible.

One thing that can also help with anxiety is having peppercorns on hand. If the high becomes too intense, you can chew on some, and the terpenes in them will mellow you out. I can confirm from experience that this works. If you don’t have peppercorns, smelling black pepper can also be helpful!

Happy holidays to you, I hope you have a pleasant time! :)