Need help with bbq

I'm on my first week of attempting keto. So far I've made 3 mistakes. I realized the pre-seasoned chciken from festival had sugar, I realized shredded cheese has secret carbs, and my sugar free BBQ has "modifies starch"

First questions, how bad is modified starch? Second, what's a good BBQ replacement? Apparently sugar free doesn't mean keto so now I need a good sauce for all the chicken I eat. (I'm okay with artificial sweetness) And what do you guys use for taco mix?