Pretty sure that you get the benefit of the doubt if you had a feasible reason for adding/changing something about your food.
For example, you could add a laxative to your food/drink and be totally in the clear as long as you labelled your container with your name and maintain that you’ve been constipated. It’s a totally valid reason, plus it was labelled with your name so there’s no reason for anyone else to be consuming it.
Debianties