Vinegar can help deter or kill drywood termites in minor infestations. The acidity in vinegar disrupts termites’ digestive systems and can kill those it comes into direct contact with. To use vinegar, mix it with water or lemon juice and apply it to termite-infested areas using a spray bottle. Focus on cracks, crevices, and wood surfaces. However, vinegar is not a reliable or comprehensive solution for termite infestations and is best used as a supplementary or preventive measure.