My son's daycare did a huge no - no?

My 3 month old son's child care facility gave me someone else's baby bottle!!!! I was so upset this happen but even more horrified with all this talk about North American Influenza ( we live in Texas ). I spoke with the director and things were handled very professional and promptly. I am not taking him out of daycare because they are a very good daycare, my older son goes as well. My question is, how else can I label my baby's bottle besides with a permanent marker because I did that but does not last with all the frequent washes. Any suggestions?