Assemble and eat. For the week ahead, layer yoghurt and fruit in jars — good for 3 days — and carry the granola separately to add at the last minute.
The yoghurt and fruit are, but granola is often closer to dessert than cereal — many are 20–30% sugar. Check the label, or use plain toasted oats and nuts.
Drain frozen or very juicy fruit first and use thick yoghurt. Watery layers are almost always the fruit, not the yoghurt.
Yes, minus the granola. The yoghurt and fruit are fine overnight and the flavour improves.