Here are some suggestions:
Drop the school agers. That will allow you to change your hours too!
Schedule work hours and send out newsletters to the parents indicating when the change will take place. (Example: Effective October 1, 2011 I will be changing my hours of operation to 7am to 530pm.)
Don't allow sippy cups outside of hardwood/laminate/linoleum flooring.
I don't allow children on my furniture. I have nothing but toys in the room so the kids do not have the luxury of climbing and carrying around a sippy cup.
Only allow drinks during meal and snack times unless they ask or are infants needing a bottle.
Put a pack and play in a room as far from where the other kids nap as possible. Put the screamer in there at nap. Get the room dark as possible and run a fan or radio. Soothing environments/fan/music help and children sleep better in dark, cool rooms.
Daycare can be done without separating areas but I think you find yourself much happier if you have a room or two (or a lower level) that you can solely dedicate to your business.
