If i only drink milk and soda, is it possible to get kidney stones?

Not necessarily: Milk contains calcium, a component of stones. Dehydration is more of a factor in stone production. Unless one has a specific metabolic abnormality, milk ingestion doesn't necessarily cause stones. Sodas have not been definitively linked to stone production. Caffeine within sodas can dehydrate, however. Dehydration, as mentioned above, is more of a factor in stone production.