I never wipe away tears on a tissue, although for me runny eyes means runny nose. So I do sneeze a lot if I'm emotional.

Pdoc has a box somewhere in his office, or at least some of the time.. so I bring my own if I remember to do so.
T should have one, but she doesn't have an office of her own (no one does in that practice), so it's happened that the previous occupant threw out the box and didn't replace it. She always has a travel pack somewhere in her purse, though.

I stuff them in my pocket and throw them out later.