This occured immediately to me too, but I felt foolish stating the obvious. Perhaps it's not so obvious; or perhaps the separate explosive ingredients induce effects tolerable for a couple of hours.
In any event, I would be on the lookout for passengers who get inexplicably sick on any flight.
Our youngest is 15, so I'm a few years out of date on baby bottles and formula. But when we quit using bottles, we were putting the formula into little plastic bag liners in the bottle. How hard would it be to put the explosives liquid into a sealed bag, put it in the bottle, and then pour ordinary formula over the sealed bag? They you could easily pass the taste test and still have your explosive "meal" inside the bottle.
I've thought for several years now that such false bottoms in many ordinary containers, such as shaving cream cans, could be used to smuggle explosives onto aircraft.