In my district we can give OTC meds with just a note from the parents. The medication must be in a labeled OTC container and must be age appropriate. I'm in an elementary school and must give children's or jr. strength meds. I can only give cough drops with permission from parents. All prescription meds must be brought in the original prescription bottle with a doctor's note AND a note from the parent.
I also have a problem getting a sub nurse. I try to find alternate childcare for my kids if they are sick (grandparents, etc.). It is horrible if I am sick and feeling guilty for leaving my school without a nurse. The only way I can sometimes find a sub is if I have advance notice for a conference or appointment or something like that.