Put Immodium and Pepto in your belt/neck pouch, so that when you are stuck on a long bus ride without access to your first-aid kit (you have one, right?) down below, you wont be in pain!
Do not leave home without your sense of humor! Things will happen and you just cant stress about it...robberies, upset stomachs when there's no toilet...just smile, at least youre not stuck in an office!