We are in the same boat. Luckily we have a health food store near us that sells soy milk and yoghurt, we don't bother with the cheese. She is very sensitive and bleeds from the bottom quite heavily if the slightest bit of dairy gets in her.

We also found some soy milk powder at a few health food stores that works well for us, although its not that much cheaper (sometimes more expensive) than the lactose free / soy milk powder for infants.

Snack wise - just fruit, museli bars etc.

HTH, PX