My musts for going to work, which is about the only place I go really...
-Earbuds -contact lens case -glasses in case my contacts have an issue -eyedrops -blood glucose meter (am diabetic) -spare AM medication dose in case I forgot -gum -umbrella -water bottle
I usually have all this in a backpack. Sometimes I'll have my switch with me, too. Or a book. Depends on my mood.
I drink pamplemousse La Croix. I just really enjoy it, way more than any other flavor or brand.