Husband is mad at me

We are on a trip. I did most of the packing, including putting the meds we need in the little organizers so theyd all fit. They were color coded per person. Twice, I told my husband what color our son's was, since he is the one who usually gives him meds. Found out today that he didnt listen or forgot and has been giving him the wrong pill for 2 days. He blamed it on me, since he said he just grabbed the first case he saw in the bag and assumed it was fine. But I put them in the purple case on purpose and told him multiple times which one was our sons. He still says its all my fault and is mad at me.