There was this plot point I wanted to use for this story where one of my characters poisons an energy drink. And I'm thinking the drink could be something like RedBull in one of those tall-skinny cans. The drink itself basically has to be an energy drink of some kind because of the way the story plays out, but I suppose it could be a plastic bottle if there is some kind of energy drink that is made that way. And so, my question is... is there a good way for my villain to poison said can/bottle using a syringe or some other tool? The thing I worry about with a syringe is that once you poke a hole in a can, that might make the drinks flat or perhaps such a hole would be easy to see. Perhaps right under the lid or something to that effect.