L. - this is so normal. I put my daughter in daycare 2x a week when I went back to work when she was about 22 months. I cried like crazy those first few weeks of work (I look back now and don't know how I focused on work). It was overwhelming for all of us. When I was upset, it upset my husband - in fact, I am upset just remembering it now.
Day one was a breeze - but the next few days were hard because she knew that we would be leaving her there. She would cry and cry but the teachers would tell us to say goodbye, leave ASAP and she would settle down in about 30 seconds. I would wait outside the door out of site. And they were RIGHT!! Your child will always want to be with her mommy and you will always want to be with her. But what can we do? Give it time and it will all be very routine.
Now, a year and a half later, she has transitioned to preschool wonderfully. She looks forward to school and is very well socialized. And - she learned a LOT in day care. Not just social skills but educational skills as well, following the rules, etc.
Having a kid that doesn't hold on to you and cry is not a bad thing. It means they are outgoing and ready to take on a challenge. I'd rather my daughter meet the world head on any day than hide in a corner or behind my leg. It's a challenge when she takes off in the mall – but…ugh!!
As for food, etc - you daughter will learn the daycare's schedule and she will adapt to it. Don't worry.
My best advice - keep a box of sanitizing hand wipes in the car and wipe her hands (and yours) the minute you get to the car. I picked up lots of my daughter’s colds and stuff last year and am trying to not repeat this year!