Definitely having crackers around really helps, have nibbly things that you can pick at so you've got a variety to choose from. I found it helped to not have limited things, lots of things that you can pick at is wonderful. Sultanas, cheese, fruit (grapes, apples etc), museli bars, english muffins.

With getting things for dinner, planning ahead really helps if you have say a weeks worth or menus you can easily chop and change things around if you don't feel like having all of the others. Having a wide varitey of things that you can make will help so it's good to not limit yourself there.

HTH