In a saucepan, combine the tomato sauce, apple cider vinegar, and Swerve sweetener.
Heat the saucepan over medium heat and whisk the ingredients together until they are well combined.
Add the smoked paprika, garlic powder, onion powder, black pepper, and salt to the saucepan.
Continue to whisk the ingredients together until they are well combined.
Once everything is combined, add the water to the saucepan and whisk again until the sauce is smooth.
Reduce the heat to low and let the sauce simmer for 10-15 minutes, stirring occasionally.
After 10-15 minutes, remove the saucepan from the heat and let it cool to room temperature.
Once the sauce has cooled, transfer it to a glass jar or airtight container.
Store the keto BBQ sauce in the refrigerator for up to two weeks.