"Write about what's in your bag/purse/backpack every day."
Well, for starters I always have my wallet with me. People might think "duh" but it's not because I'm neurotic about someone stealing the little money I do have - it's because I have a list in there of what I'm allergic to, my meds, my health issues, and my doctors/emergency contacts. If I manage to not have my wallet, then I always have my phone with the same information. I really should get a bracelet but meeeeh.
I shouldn't have that attitude.
I also always make sure to have a pen. When you need one you never really have one.
I always have to have chap stick and lotion also, especially heading into the drier months. I usually will have cough drops then too.
No matter where I go though, I always make sure to have my little thing of pills with me. No matter how many purse transfers I go through for whatever reasons, I always have that and I always refill it (or at least check to see if I need to) once a week when I refill my daily pill holder. Some days I don't need that second NSAID dose or a multitude of muscle relaxers, but it's always better to have them and not need them than to need them and not have them.
What are some of the must-haves you carry with you?