Warm water and vinegar can kill the virus
This claim is spreading within social media but it is difficult to track origination.
"Warm" is not very descriptive but the Sars-Cov-2 virus can withstand temperatures up to 131 degrees Fahrenheit. The WHO mentions that the virus completely denatures at 132 degrees for 15 minutes.
Household vinegar is a weak acid that can inhibit bacterial growth ex vivo such as in beakers and on hard surfaces. Coronaviruses are not bacteria. Stronger concentrations (~10%) could be effective but this could damage cellular tissue as well.
This should go without saying, please do not drink vinegar or gargle strong acetic acids to try and "kill" the virus. Again, the virus hides in your cells, so how would contact with vinegar impact it? Also, if the virus is in your lungs, how will warm water and vinegar stop it? What you drink goes into your stomach correct?