I went to Penny just now and picked up a bag (the Bravo ones with the Penny logo on the back), but they must've changed the recipe. It's not really hot, tastes like the Rewe ones :/
Edit: I just checked, the Rewe Feuerdrachen and the Penny ones are the same, same ingredients, same manufacturer
My limited research (finding a dedicated fan community on Reddit and reading the posts on there lol) leads me to believe I may not find the "real deal"... But I'll give it a shot anyway, thanks!
(Research because Rewe has something called Feuerdrachen and those suck :/)
Do they like spicy things? If so, maybe bring some really spicy snack. I've been disappointed by everything from the snack aisle that says "hot" on it and I don't handle spice well at all. I suspect the US has much hotter snacks??
There's a Sawbones episode on fluoride and its effects on teeth (and why it's good for you), if you like to be educated and entertained at the same time, I highly recommend listening to it! Great podcast.