Store yoghurt in its original container in the fridge.
We often throw away yoghurt because it has gone watery. This process is the whey separating from the solids, which happens over time. Give the yoghurt a good stir to incorporate the whey and it will be fine to eat again. Yoghurt can still be eaten after its best before date – just use your senses to make sure it looks, smells and tastes ok.
Yoghurt can be successfully frozen, just be aware that it will expand when it is frozen so make sure there is enough room in the container.