Essentially Gin is just Vodka with herbs and aromatics and such added during the process.

Back to the issue of water purification I did some reading on Pasteurization and using milk as a baseline example you get a Log 5 (I think) kill rate by going 161F for 10 to 15 seconds. Plus I hear that there are nastier more heat resistant bugs in milk potentially than in water.

Super Pasteurized Milk is heated to 250F for a fraction of a second...that should tell you that time doesn't matter.