I am doing treat bags (no candy) for my DD MDO class of 2 and under.
I am putting in the bags, small cans of play dough, halloween stickers, halloween stamps, Halloween straws, Halloween small glow sticks. ALL CAN BE FOUND AT WAL*MART.
You can also put bags of individual pkgs of goldfish crackers, animal crackers or vanilla wafers (etc.) This is what I handed out to the toddlers that came to my door last year for Halloween.