If you decide to make your own hot sauce then you can make it keto-friendly. After all, the hot sauce should only include vinegar, salt, and peppers which are keto-friendly ingredients. Should you buy it in the bottle at the store then check the ingredients list and label for any added sugars. Particularly flavored hot sauce can include fruit or sugar content which ramps up the carbohydrate content.  Try to avoid sweet chili hot sauce as you can envisage they contain plenty of added sugar. For your own homemade batch of hot sauce, try to use jalapeño peppers as each one should only contain 0.5g of net carbs.