☯Items you should have in your emergency bag in your school bag/locker:
-plasters
-PADS/TAMPONS
-chapstick
-mirror with that little brush on the other side
-water bottle
-hand lotion
-hand sanitizer
-hair bands/headbands
-bobby pins
-nail fail
-blotting sheets
-stain remover stick
-body spray/deodorant
-tissues
-mints
-tablets for different occasions like headache or cramps and etc
-any make up item you might need to touch up on: concealer, mascara, lipstick
-toothbrush and/or floss or something like that
-spare money(in case you forget your lunch/ lunch money)
-snacks
-safety pins
I'm pretty sure that is it so good luck if you don't have a locker!
Also you might not need certain things as I got most of these ideas from myself but some I got from my friends and the internet