I'd recommend a gun safe for a number of reasons besides this, but if you don't have access to the safe it might be a solution to the possession problem.
Their function also improves the results if the drink is more basic. A drink with a pH of 13 would have an amazing score on here.
If you normalize the pH above 5.5 since it has "little to no effect" things on the lower end of the results are better, with milk being worse than water, and chocolate milk being worse than milk.
https://en.wikipedia.org/wiki/Great_Fire_of_Rome