Blast (and other interested parties),

Tell your DW that it's for "medicinal purposes" because of it's "disinfectant abilities". There's #1 "reason".

Tell your DW that it has great "barter value" because of it's "drinkability and disinfectant abilities which would allow you to trade for something that is very needed,,,like disposable diapers and baby wipes for DD2*. There's #2 "reason".

(*note: this "reason" expires at the time DD2 graduates into panties after being successfully potty trained)