Poor kid!

We had ice cream buckets all over the house when I was growing up- they were ever so useful for things like fulling the humidifier or storing cookies and yes, puke buckets. (We even had at least one in the car always)

Eventually he will learn how to listen to his body and know the difference between "there is something in my throat" and "I have to puke." Unfortunately, the only way to learn that is through experience.