I always serve food at my Broker Open Tours. I believe it helps with showing numbers. I usually get more that the other agents. Last week at the MLS meeting just before the tour I advertised Non alcoholic White Riesling, no sugar,no calories and no taste, (bottled water) and string cheese. I find that if they drop bottled water or string cheese it doesn't make a problem on white carpets.
Years ago in my own home I offered little sub sandwiches. We spent quite awhile picking up lettuce and olives from one end of the house to the other. I decided that we won't do that in a clients home as a vacuum cleaner doesn't fit my hands.
A word to the wise, I served Bran muffins and Prune juice. I announced it at the MLS meeting and attendance at more showing was real poor, I got the message! What works best for you?