12 Best Natural Immunity Boosters For Cold And Flu This Winter 8. Make a homemade cough syrupMix 1⁄4 cup honey and 1⁄4 apple cider vinegar;mix well and take 1 tbsp every 4 hours. 8 of 13 See morePrevious article Peanut Butter SnowballsNext article Signs You Might Have Type 2 Diabetes